HTML Examples/WP.iso/wordpress/wp-includes/ms-functions.php

PHP Script | 2018-01-23 | 89.0 KB | 2,745 lines

<?php
/**
 * Multisite WordPress API
 *
 * @package WordPress
 * @subpackage Multisite
 * @since 3.0.0
 */

/**
 * Gets the network's site and user counts.
 *
 * @since MU (3.0.0)
 *
 * @return array Site and user count for the network.
 */
function get_sitestats() {
    $stats = array(
        'blogs' => get_blog_count(),
        'users' => get_user_count(),
    );

    return $stats;
}

/**
 * Get one of a user's active blogs
 *
 * Returns the user's primary blog, if they have one and
 * it is active. If it's inactive, function returns another
 * active blog of the user. If none are found, the user
 * is added as a Subscriber to the Dashboard Blog and that blog
 * is returned.
 *
 * @since MU (3.0.0)
 *
 * @param int $user_id The unique ID of the user
 * @return WP_Site|void The blog object
 */
function get_active_blog_for_user( $user_id ) {
    $blogs = get_blogs_of_user( $user_id );
    if ( empty( $blogs ) )
        return;

    if ( ! is_multisite() ) {
        return $blogs[ get_current_blog_id() ];
    }

    $primary_blog = get_user_meta( $user_id, 'primary_blog', true );
    $first_blog = current($blogs);
    if ( false !== $primary_blog ) {
        if ( ! isset( $blogs[ $primary_blog ] ) ) {
            update_user_meta( $user_id, 'primary_blog', $first_blog->userblog_id );
            $primary = get_site( $first_blog->userblog_id );
        } else {
            $primary = get_site( $primary_blog );
        }
    } else {
        //TODO Review this call to add_user_to_blog too - to get here the user must have a role on this blog?
        $result = add_user_to_blog( $first_blog->userblog_id, $user_id, 'subscriber' );

        if ( ! is_wp_error( $result ) ) {
            update_user_meta( $user_id, 'primary_blog', $first_blog->userblog_id );
            $primary = $first_blog;
        }
    }

    if ( ( ! is_object( $primary ) ) || ( $primary->archived == 1 || $primary->spam == 1 || $primary->deleted == 1 ) ) {
        $blogs = get_blogs_of_user( $user_id, true ); // if a user's primary blog is shut down, check their other blogs.
        $ret = false;
        if ( is_array( $blogs ) && count( $blogs ) > 0 ) {
            foreach ( (array) $blogs as $blog_id => $blog ) {
                if ( $blog->site_id != get_current_network_id() )
                    continue;
                $details = get_site( $blog_id );
                if ( is_object( $details ) && $details->archived == 0 && $details->spam == 0 && $details->deleted == 0 ) {
                    $ret = $blog;
                    if ( get_user_meta( $user_id , 'primary_blog', true ) != $blog_id )
                        update_user_meta( $user_id, 'primary_blog', $blog_id );
                    if ( !get_user_meta($user_id , 'source_domain', true) )
                        update_user_meta( $user_id, 'source_domain', $blog->domain );
                    break;
                }
            }
        } else {
            return;
        }
        return $ret;
    } else {
        return $primary;
    }
}

/**
 * The number of active users in your installation.
 *
 * The count is cached and updated twice daily. This is not a live count.
 *
 * @since MU (3.0.0)
 * @since 4.8.0 The $network_id parameter has been added.
 *
 * @param int|null $network_id ID of the network. Default is the current network.
 * @return int Number of active users on the network.
 */
function get_user_count( $network_id = null ) {
    return get_network_option( $network_id, 'user_count' );
}

/**
 * The number of active sites on your installation.
 *
 * The count is cached and updated twice daily. This is not a live count.
 *
 * @since MU (3.0.0)
 * @since 3.7.0 The $network_id parameter has been deprecated.
 * @since 4.8.0 The $network_id parameter is now being used.
 *
 * @param int|null $network_id ID of the network. Default is the current network.
 * @return int Number of active sites on the network.
 */
function get_blog_count( $network_id = null ) {
    return get_network_option( $network_id, 'blog_count' );
}

/**
 * Get a blog post from any site on the network.
 *
 * @since MU (3.0.0)
 *
 * @param int $blog_id ID of the blog.
 * @param int $post_id ID of the post you're looking for.
 * @return WP_Post|null WP_Post on success or null on failure
 */
function get_blog_post( $blog_id, $post_id ) {
    switch_to_blog( $blog_id );
    $post = get_post( $post_id );
    restore_current_blog();

    return $post;
}

/**
 * Adds a user to a blog.
 *
 * Use the {@see 'add_user_to_blog'} action to fire an event when users are added to a blog.
 *
 * @since MU (3.0.0)
 *
 * @param int    $blog_id ID of the blog you're adding the user to.
 * @param int    $user_id ID of the user you're adding.
 * @param string $role    The role you want the user to have
 * @return true|WP_Error
 */
function add_user_to_blog( $blog_id, $user_id, $role ) {
    switch_to_blog($blog_id);

    $user = get_userdata( $user_id );

    if ( ! $user ) {
        restore_current_blog();
        return new WP_Error( 'user_does_not_exist', __( 'The requested user does not exist.' ) );
    }

    /**
     * Filters whether a user should be added to a site.
     *
     * @since 4.9.0
     *
     * @param bool|WP_Error $retval  True if the user should be added to the site, false
     *                               or error object otherwise.
     * @param int           $user_id User ID.
     * @param string        $role    User role.
     * @param int           $blog_id Site ID.
     */
    $can_add_user = apply_filters( 'can_add_user_to_blog', true, $user_id, $role, $blog_id );

    if ( true !== $can_add_user ) {
        restore_current_blog();

        if ( is_wp_error( $can_add_user ) ) {
            return $can_add_user;
        }

        return new WP_Error( 'user_cannot_be_added', __( 'User cannot be added to this site.' ) );
    }

    if ( !get_user_meta($user_id, 'primary_blog', true) ) {
        update_user_meta($user_id, 'primary_blog', $blog_id);
        $site = get_site( $blog_id );
        update_user_meta( $user_id, 'source_domain', $site->domain );
    }

    $user->set_role($role);

    /**
     * Fires immediately after a user is added to a site.
     *
     * @since MU (3.0.0)
     *
     * @param int    $user_id User ID.
     * @param string $role    User role.
     * @param int    $blog_id Blog ID.
     */
    do_action( 'add_user_to_blog', $user_id, $role, $blog_id );
    wp_cache_delete( $user_id, 'users' );
    wp_cache_delete( $blog_id . '_user_count', 'blog-details' );
    restore_current_blog();
    return true;
}

/**
 * Remove a user from a blog.
 *
 * Use the {@see 'remove_user_from_blog'} action to fire an event when
 * users are removed from a blog.
 *
 * Accepts an optional `$reassign` parameter, if you want to
 * reassign the user's blog posts to another user upon removal.
 *
 * @since MU (3.0.0)
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int    $user_id  ID of the user you're removing.
 * @param int    $blog_id  ID of the blog you're removing the user from.
 * @param string $reassign Optional. A user to whom to reassign posts.
 * @return true|WP_Error
 */
function remove_user_from_blog($user_id, $blog_id = '', $reassign = '') {
    global $wpdb;
    switch_to_blog($blog_id);
    $user_id = (int) $user_id;
    /**
     * Fires before a user is removed from a site.
     *
     * @since MU (3.0.0)
     *
     * @param int $user_id User ID.
     * @param int $blog_id Blog ID.
     */
    do_action( 'remove_user_from_blog', $user_id, $blog_id );

    // If being removed from the primary blog, set a new primary if the user is assigned
    // to multiple blogs.
    $primary_blog = get_user_meta($user_id, 'primary_blog', true);
    if ( $primary_blog == $blog_id ) {
        $new_id = '';
        $new_domain = '';
        $blogs = get_blogs_of_user($user_id);
        foreach ( (array) $blogs as $blog ) {
            if ( $blog->userblog_id == $blog_id )
                continue;
            $new_id = $blog->userblog_id;
            $new_domain = $blog->domain;
            break;
        }

        update_user_meta($user_id, 'primary_blog', $new_id);
        update_user_meta($user_id, 'source_domain', $new_domain);
    }

    // wp_revoke_user($user_id);
    $user = get_userdata( $user_id );
    if ( ! $user ) {
        restore_current_blog();
        return new WP_Error('user_does_not_exist', __('That user does not exist.'));
    }

    $user->remove_all_caps();

    $blogs = get_blogs_of_user($user_id);
    if ( count($blogs) == 0 ) {
        update_user_meta($user_id, 'primary_blog', '');
        update_user_meta($user_id, 'source_domain', '');
    }

    if ( $reassign != '' ) {
        $reassign = (int) $reassign;
        $post_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_author = %d", $user_id ) );
        $link_ids = $wpdb->get_col( $wpdb->prepare( "SELECT link_id FROM $wpdb->links WHERE link_owner = %d", $user_id ) );

        if ( ! empty( $post_ids ) ) {
            $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->posts SET post_author = %d WHERE post_author = %d", $reassign, $user_id ) );
            array_walk( $post_ids, 'clean_post_cache' );
        }

        if ( ! empty( $link_ids ) ) {
            $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->links SET link_owner = %d WHERE link_owner = %d", $reassign, $user_id ) );
            array_walk( $link_ids, 'clean_bookmark_cache' );
        }
    }

    restore_current_blog();

    return true;
}

/**
 * Get the permalink for a post on another blog.
 *
 * @since MU (3.0.0) 1.0
 *
 * @param int $blog_id ID of the source blog.
 * @param int $post_id ID of the desired post.
 * @return string The post's permalink
 */
function get_blog_permalink( $blog_id, $post_id ) {
    switch_to_blog( $blog_id );
    $link = get_permalink( $post_id );
    restore_current_blog();

    return $link;
}

/**
 * Get a blog's numeric ID from its URL.
 *
 * On a subdirectory installation like example.com/blog1/,
 * $domain will be the root 'example.com' and $path the
 * subdirectory '/blog1/'. With subdomains like blog1.example.com,
 * $domain is 'blog1.example.com' and $path is '/'.
 *
 * @since MU (3.0.0)
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $domain
 * @param string $path   Optional. Not required for subdomain installations.
 * @return int 0 if no blog found, otherwise the ID of the matching blog
 */
function get_blog_id_from_url( $domain, $path = '/' ) {
    $domain = strtolower( $domain );
    $path = strtolower( $path );
    $id = wp_cache_get( md5( $domain . $path ), 'blog-id-cache' );

    if ( $id == -1 ) // blog does not exist
        return 0;
    elseif ( $id )
        return (int) $id;

    $args = array(
        'domain' => $domain,
        'path' => $path,
        'fields' => 'ids',
        'number' => 1,
    );
    $result = get_sites( $args );
    $id = array_shift( $result );

    if ( ! $id ) {
        wp_cache_set( md5( $domain . $path ), -1, 'blog-id-cache' );
        return 0;
    }

    wp_cache_set( md5( $domain . $path ), $id, 'blog-id-cache' );

    return $id;
}

// Admin functions

/**
 * Checks an email address against a list of banned domains.
 *
 * This function checks against the Banned Email Domains list
 * at wp-admin/network/settings.php. The check is only run on
 * self-registrations; user creation at wp-admin/network/users.php
 * bypasses this check.
 *
 * @since MU (3.0.0)
 *
 * @param string $user_email The email provided by the user at registration.
 * @return bool Returns true when the email address is banned.
 */
function is_email_address_unsafe( $user_email ) {
    $banned_names = get_site_option( 'banned_email_domains' );
    if ( $banned_names && ! is_array( $banned_names ) )
        $banned_names = explode( "\n", $banned_names );

    $is_email_address_unsafe = false;

    if ( $banned_names && is_array( $banned_names ) && false !== strpos( $user_email, '@', 1 ) ) {
        $banned_names = array_map( 'strtolower', $banned_names );
        $normalized_email = strtolower( $user_email );

        list( $email_local_part, $email_domain ) = explode( '@', $normalized_email );

        foreach ( $banned_names as $banned_domain ) {
            if ( ! $banned_domain )
                continue;

            if ( $email_domain == $banned_domain ) {
                $is_email_address_unsafe = true;
                break;
            }

            $dotted_domain = ".$banned_domain";
            if ( $dotted_domain === substr( $normalized_email, -strlen( $dotted_domain ) ) ) {
                $is_email_address_unsafe = true;
                break;
            }
        }
    }

    /**
     * Filters whether an email address is unsafe.
     *
     * @since 3.5.0
     *
     * @param bool   $is_email_address_unsafe Whether the email address is "unsafe". Default false.
     * @param string $user_email              User email address.
     */
    return apply_filters( 'is_email_address_unsafe', $is_email_address_unsafe, $user_email );
}

/**
 * Sanitize and validate data required for a user sign-up.
 *
 * Verifies the validity and uniqueness of user names and user email addresses,
 * and checks email addresses against admin-provided domain whitelists and blacklists.
 *
 * The {@see 'wpmu_validate_user_signup'} hook provides an easy way to modify the sign-up
 * process. The value $result, which is passed to the hook, contains both the user-provided
 * info and the error messages created by the function. {@see 'wpmu_validate_user_signup'}
 * allows you to process the data in any way you'd like, and unset the relevant errors if
 * necessary.
 *
 * @since MU (3.0.0)
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $user_name  The login name provided by the user.
 * @param string $user_email The email provided by the user.
 * @return array Contains username, email, and error messages.
 */
function wpmu_validate_user_signup($user_name, $user_email) {
    global $wpdb;

    $errors = new WP_Error();

    $orig_username = $user_name;
    $user_name = preg_replace( '/\s+/', '', sanitize_user( $user_name, true ) );

    if ( $user_name != $orig_username || preg_match( '/[^a-z0-9]/', $user_name ) ) {
        $errors->add( 'user_name', __( 'Usernames can only contain lowercase letters (a-z) and numbers.' ) );
        $user_name = $orig_username;
    }

    $user_email = sanitize_email( $user_email );

    if ( empty( $user_name ) )
           $errors->add('user_name', __( 'Please enter a username.' ) );

    $illegal_names = get_site_option( 'illegal_names' );
    if ( ! is_array( $illegal_names ) ) {
        $illegal_names = array(  'www', 'web', 'root', 'admin', 'main', 'invite', 'administrator' );
        add_site_option( 'illegal_names', $illegal_names );
    }
    if ( in_array( $user_name, $illegal_names ) ) {
        $errors->add( 'user_name',  __( 'Sorry, that username is not allowed.' ) );
    }

    /** This filter is documented in wp-includes/user.php */
    $illegal_logins = (array) apply_filters( 'illegal_user_logins', array() );

    if ( in_array( strtolower( $user_name ), array_map( 'strtolower', $illegal_logins ) ) ) {
        $errors->add( 'user_name',  __( 'Sorry, that username is not allowed.' ) );
    }

    if ( ! is_email( $user_email ) ) {
        $errors->add( 'user_email', __( 'Please enter a valid email address.' ) );
    } elseif ( is_email_address_unsafe( $user_email ) ) {
        $errors->add( 'user_email', __( 'You cannot use that email address to signup. We are having problems with them blocking some of our email. Please use another email provider.' ) );
    }

    if ( strlen( $user_name ) < 4 )
        $errors->add('user_name',  __( 'Username must be at least 4 characters.' ) );

    if ( strlen( $user_name ) > 60 ) {
        $errors->add( 'user_name', __( 'Username may not be longer than 60 characters.' ) );
    }

    // all numeric?
    if ( preg_match( '/^[0-9]*$/', $user_name ) )
        $errors->add('user_name', __('Sorry, usernames must have letters too!'));

    $limited_email_domains = get_site_option( 'limited_email_domains' );
    if ( is_array( $limited_email_domains ) && ! empty( $limited_email_domains ) ) {
        $emaildomain = substr( $user_email, 1 + strpos( $user_email, '@' ) );
        if ( ! in_array( $emaildomain, $limited_email_domains ) ) {
            $errors->add('user_email', __('Sorry, that email address is not allowed!'));
        }
    }

    // Check if the username has been used already.
    if ( username_exists($user_name) )
        $errors->add( 'user_name', __( 'Sorry, that username already exists!' ) );

    // Check if the email address has been used already.
    if ( email_exists($user_email) )
        $errors->add( 'user_email', __( 'Sorry, that email address is already used!' ) );

    // Has someone already signed up for this username?
    $signup = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->signups WHERE user_login = %s", $user_name) );
    if ( $signup != null ) {
        $registered_at =  mysql2date('U', $signup->registered);
        $now = current_time( 'timestamp', true );
        $diff = $now - $registered_at;
        // If registered more than two days ago, cancel registration and let this signup go through.
        if ( $diff > 2 * DAY_IN_SECONDS )
            $wpdb->delete( $wpdb->signups, array( 'user_login' => $user_name ) );
        else
            $errors->add('user_name', __('That username is currently reserved but may be available in a couple of days.'));
    }

    $signup = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->signups WHERE user_email = %s", $user_email) );
    if ( $signup != null ) {
        $diff = current_time( 'timestamp', true ) - mysql2date('U', $signup->registered);
        // If registered more than two days ago, cancel registration and let this signup go through.
        if ( $diff > 2 * DAY_IN_SECONDS )
            $wpdb->delete( $wpdb->signups, array( 'user_email' => $user_email ) );
        else
            $errors->add('user_email', __('That email address has already been used. Please check your inbox for an activation email. It will become available in a couple of days if you do nothing.'));
    }

    $result = array('user_name' => $user_name, 'orig_username' => $orig_username, 'user_email' => $user_email, 'errors' => $errors);

    /**
     * Filters the validated user registration details.
     *
     * This does not allow you to override the username or email of the user during
     * registration. The values are solely used for validation and error handling.
     *
     * @since MU (3.0.0)
     *
     * @param array $result {
     *     The array of user name, email and the error messages.
     *
     *     @type string   $user_name     Sanitized and unique username.
     *     @type string   $orig_username Original username.
     *     @type string   $user_email    User email address.
     *     @type WP_Error $errors        WP_Error object containing any errors found.
     * }
     */
    return apply_filters( 'wpmu_validate_user_signup', $result );
}

/**
 * Processes new site registrations.
 *
 * Checks the data provided by the user during blog signup. Verifies
 * the validity and uniqueness of blog paths and domains.
 *
 * This function prevents the current user from registering a new site
 * with a blogname equivalent to another user's login name. Passing the
 * $user parameter to the function, where $user is the other user, is
 * effectively an override of this limitation.
 *
 * Filter {@see 'wpmu_validate_blog_signup'} if you want to modify
 * the way that WordPress validates new site signups.
 *
 * @since MU (3.0.0)
 *
 * @global wpdb   $wpdb
 * @global string $domain
 *
 * @param string         $blogname   The blog name provided by the user. Must be unique.
 * @param string         $blog_title The blog title provided by the user.
 * @param WP_User|string $user       Optional. The user object to check against the new site name.
 * @return array Contains the new site data and error messages.
 */
function wpmu_validate_blog_signup( $blogname, $blog_title, $user = '' ) {
    global $wpdb, $domain;

    $current_network = get_network();
    $base = $current_network->path;

    $blog_title = strip_tags( $blog_title );

    $errors = new WP_Error();
    $illegal_names = get_site_option( 'illegal_names' );
    if ( $illegal_names == false ) {
        $illegal_names = array( 'www', 'web', 'root', 'admin', 'main', 'invite', 'administrator' );
        add_site_option( 'illegal_names', $illegal_names );
    }

    /*
     * On sub dir installations, some names are so illegal, only a filter can
     * spring them from jail.
     */
    if ( ! is_subdomain_install() ) {
        $illegal_names = array_merge( $illegal_names, get_subdirectory_reserved_names() );
    }

    if ( empty( $blogname ) )
        $errors->add('blogname', __( 'Please enter a site name.' ) );

    if ( preg_match( '/[^a-z0-9]+/', $blogname ) ) {
        $errors->add( 'blogname', __( 'Site names can only contain lowercase letters (a-z) and numbers.' ) );
    }

    if ( in_array( $blogname, $illegal_names ) )
        $errors->add('blogname',  __( 'That name is not allowed.' ) );

    /**
     * Filters the minimum site name length required when validating a site signup.
     *
     * @since 4.8.0
     *
     * @param int $length The minimum site name length. Default 4.
     */
    $minimum_site_name_length = apply_filters( 'minimum_site_name_length', 4 );

    if ( strlen( $blogname ) < $minimum_site_name_length ) {
        /* translators: %s: minimum site name length */
        $errors->add( 'blogname', sprintf( _n( 'Site name must be at least %s character.', 'Site name must be at least %s characters.', $minimum_site_name_length ), number_format_i18n( $minimum_site_name_length ) ) );
    }

    // do not allow users to create a blog that conflicts with a page on the main blog.
    if ( !is_subdomain_install() && $wpdb->get_var( $wpdb->prepare( "SELECT post_name FROM " . $wpdb->get_blog_prefix( $current_network->site_id ) . "posts WHERE post_type = 'page' AND post_name = %s", $blogname ) ) )
        $errors->add( 'blogname', __( 'Sorry, you may not use that site name.' ) );

    // all numeric?
    if ( preg_match( '/^[0-9]*$/', $blogname ) )
        $errors->add('blogname', __('Sorry, site names must have letters too!'));

    /**
     * Filters the new site name during registration.
     *
     * The name is the site's subdomain or the site's subdirectory
     * path depending on the network settings.
     *
     * @since MU (3.0.0)
     *
     * @param string $blogname Site name.
     */
    $blogname = apply_filters( 'newblogname', $blogname );

    $blog_title = wp_unslash(  $blog_title );

    if ( empty( $blog_title ) )
        $errors->add('blog_title', __( 'Please enter a site title.' ) );

    // Check if the domain/path has been used already.
    if ( is_subdomain_install() ) {
        $mydomain = $blogname . '.' . preg_replace( '|^www\.|', '', $domain );
        $path = $base;
    } else {
        $mydomain = "$domain";
        $path = $base.$blogname.'/';
    }
    if ( domain_exists($mydomain, $path, $current_network->id) )
        $errors->add( 'blogname', __( 'Sorry, that site already exists!' ) );

    if ( username_exists( $blogname ) ) {
        if ( ! is_object( $user ) || ( is_object($user) && ( $user->user_login != $blogname ) ) )
            $errors->add( 'blogname', __( 'Sorry, that site is reserved!' ) );
    }

    // Has someone already signed up for this domain?
    $signup = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->signups WHERE domain = %s AND path = %s", $mydomain, $path) ); // TODO: Check email too?
    if ( ! empty($signup) ) {
        $diff = current_time( 'timestamp', true ) - mysql2date('U', $signup->registered);
        // If registered more than two days ago, cancel registration and let this signup go through.
        if ( $diff > 2 * DAY_IN_SECONDS )
            $wpdb->delete( $wpdb->signups, array( 'domain' => $mydomain , 'path' => $path ) );
        else
            $errors->add('blogname', __('That site is currently reserved but may be available in a couple days.'));
    }

    $result = array('domain' => $mydomain, 'path' => $path, 'blogname' => $blogname, 'blog_title' => $blog_title, 'user' => $user, 'errors' => $errors);

    /**
     * Filters site details and error messages following registration.
     *
     * @since MU (3.0.0)
     *
     * @param array $result {
     *     Array of domain, path, blog name, blog title, user and error messages.
     *
     *     @type string         $domain     Domain for the site.
     *     @type string         $path       Path for the site. Used in subdirectory installations.
     *     @type string         $blogname   The unique site name (slug).
     *     @type string         $blog_title Blog title.
     *     @type string|WP_User $user       By default, an empty string. A user object if provided.
     *     @type WP_Error       $errors     WP_Error containing any errors found.
     * }
     */
    return apply_filters( 'wpmu_validate_blog_signup', $result );
}

/**
 * Record site signup information for future activation.
 *
 * @since MU (3.0.0)
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $domain     The requested domain.
 * @param string $path       The requested path.
 * @param string $title      The requested site title.
 * @param string $user       The user's requested login name.
 * @param string $user_email The user's email address.
 * @param array  $meta       Optional. Signup meta data. By default, contains the requested privacy setting and lang_id.
 */
function wpmu_signup_blog( $domain, $path, $title, $user, $user_email, $meta = array() )  {
    global $wpdb;

    $key = substr( md5( time() . wp_rand() . $domain ), 0, 16 );

    /**
     * Filters the metadata for a site signup.
     *
     * The metadata will be serialized prior to storing it in the database.
     *
     * @since 4.8.0
     *
     * @param array  $meta       Signup meta data. Default empty array.
     * @param string $domain     The requested domain.
     * @param string $path       The requested path.
     * @param string $title      The requested site title.
     * @param string $user       The user's requested login name.
     * @param string $user_email The user's email address.
     * @param string $key        The user's activation key.
     */
    $meta = apply_filters( 'signup_site_meta', $meta, $domain, $path, $title, $user, $user_email, $key );

    $wpdb->insert( $wpdb->signups, array(
        'domain' => $domain,
        'path' => $path,
        'title' => $title,
        'user_login' => $user,
        'user_email' => $user_email,
        'registered' => current_time('mysql', true),
        'activation_key' => $key,
        'meta' => serialize( $meta )
    ) );

    /**
     * Fires after site signup information has been written to the database.
     *
     * @since 4.4.0
     *
     * @param string $domain     The requested domain.
     * @param string $path       The requested path.
     * @param string $title      The requested site title.
     * @param string $user       The user's requested login name.
     * @param string $user_email The user's email address.
     * @param string $key        The user's activation key.
     * @param array  $meta       Signup meta data. By default, contains the requested privacy setting and lang_id.
     */
    do_action( 'after_signup_site', $domain, $path, $title, $user, $user_email, $key, $meta );
}

/**
 * Record user signup information for future activation.
 *
 * This function is used when user registration is open but
 * new site registration is not.
 *
 * @since MU (3.0.0)
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $user       The user's requested login name.
 * @param string $user_email The user's email address.
 * @param array  $meta       Optional. Signup meta data. Default empty array.
 */
function wpmu_signup_user( $user, $user_email, $meta = array() ) {
    global $wpdb;

    // Format data
    $user = preg_replace( '/\s+/', '', sanitize_user( $user, true ) );
    $user_email = sanitize_email( $user_email );
    $key = substr( md5( time() . wp_rand() . $user_email ), 0, 16 );

    /**
     * Filters the metadata for a user signup.
     *
     * The metadata will be serialized prior to storing it in the database.
     *
     * @since 4.8.0
     *
     * @param array  $meta       Signup meta data. Default empty array.
     * @param string $user       The user's requested login name.
     * @param string $user_email The user's email address.
     * @param string $key        The user's activation key.
     */
    $meta = apply_filters( 'signup_user_meta', $meta, $user, $user_email, $key );

    $wpdb->insert( $wpdb->signups, array(
        'domain' => '',
        'path' => '',
        'title' => '',
        'user_login' => $user,
        'user_email' => $user_email,
        'registered' => current_time('mysql', true),
        'activation_key' => $key,
        'meta' => serialize( $meta )
    ) );

    /**
     * Fires after a user's signup information has been written to the database.
     *
     * @since 4.4.0
     *
     * @param string $user       The user's requested login name.
     * @param string $user_email The user's email address.
     * @param string $key        The user's activation key.
     * @param array  $meta       Signup meta data. Default empty array.
     */
    do_action( 'after_signup_user', $user, $user_email, $key, $meta );
}

/**
 * Send a confirmation request email to a user when they sign up for a new site. The new site will not become active
 * until the confirmation link is clicked.
 *
 * This is the notification function used when site registration
 * is enabled.
 *
 * Filter {@see 'wpmu_signup_blog_notification'} to bypass this function or
 * replace it with your own notification behavior.
 *
 * Filter {@see 'wpmu_signup_blog_notification_email'} and
 * {@see 'wpmu_signup_blog_notification_subject'} to change the content
 * and subject line of the email sent to newly registered users.
 *
 * @since MU (3.0.0)
 *
 * @param string $domain     The new blog domain.
 * @param string $path       The new blog path.
 * @param string $title      The site title.
 * @param string $user_login The user's login name.
 * @param string $user_email The user's email address.
 * @param string $key        The activation key created in wpmu_signup_blog()
 * @param array  $meta       Optional. Signup meta data. By default, contains the requested privacy setting and lang_id.
 * @return bool
 */
function wpmu_signup_blog_notification( $domain, $path, $title, $user_login, $user_email, $key, $meta = array() ) {
    /**
     * Filters whether to bypass the new site email notification.
     *
     * @since MU (3.0.0)
     *
     * @param string|bool $domain     Site domain.
     * @param string      $path       Site path.
     * @param string      $title      Site title.
     * @param string      $user_login User login name.
     * @param string      $user_email User email address.
     * @param string      $key        Activation key created in wpmu_signup_blog().
     * @param array       $meta       Signup meta data. By default, contains the requested privacy setting and lang_id.
     */
    if ( ! apply_filters( 'wpmu_signup_blog_notification', $domain, $path, $title, $user_login, $user_email, $key, $meta ) ) {
        return false;
    }

    // Send email with activation link.
    if ( !is_subdomain_install() || get_current_network_id() != 1 )
        $activate_url = network_site_url("wp-activate.php?key=$key");
    else
        $activate_url = "http://{$domain}{$path}wp-activate.php?key=$key"; // @todo use *_url() API

    $activate_url = esc_url($activate_url);
    $admin_email = get_site_option( 'admin_email' );
    if ( $admin_email == '' )
        $admin_email = 'support@' . $_SERVER['SERVER_NAME'];
    $from_name = get_site_option( 'site_name' ) == '' ? 'WordPress' : esc_html( get_site_option( 'site_name' ) );
    $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n";

    $user = get_user_by( 'login', $user_login );
    $switched_locale = switch_to_locale( get_user_locale( $user ) );

    $message = sprintf(
        /**
         * Filters the message content of the new blog notification email.
         *
         * Content should be formatted for transmission via wp_mail().
         *
         * @since MU (3.0.0)
         *
         * @param string $content    Content of the notification email.
         * @param string $domain     Site domain.
         * @param string $path       Site path.
         * @param string $title      Site title.
         * @param string $user_login User login name.
         * @param string $user_email User email address.
         * @param string $key        Activation key created in wpmu_signup_blog().
         * @param array  $meta       Signup meta data. By default, contains the requested privacy setting and lang_id.
         */
        apply_filters( 'wpmu_signup_blog_notification_email',
            __( "To activate your blog, please click the following link:\n\n%s\n\nAfter you activate, you will receive *another email* with your login.\n\nAfter you activate, you can visit your site here:\n\n%s" ),
            $domain, $path, $title, $user_login, $user_email, $key, $meta
        ),
        $activate_url,
        esc_url( "http://{$domain}{$path}" ),
        $key
    );
    // TODO: Don't hard code activation link.
    $subject = sprintf(
        /**
         * Filters the subject of the new blog notification email.
         *
         * @since MU (3.0.0)
         *
         * @param string $subject    Subject of the notification email.
         * @param string $domain     Site domain.
         * @param string $path       Site path.
         * @param string $title      Site title.
         * @param string $user_login User login name.
         * @param string $user_email User email address.
         * @param string $key        Activation key created in wpmu_signup_blog().
         * @param array  $meta       Signup meta data. By default, contains the requested privacy setting and lang_id.
         */
        apply_filters( 'wpmu_signup_blog_notification_subject',
            /* translators: New site notification email subject. 1: Network name, 2: New site URL */
            _x( '[%1$s] Activate %2$s', 'New site notification email subject' ),
            $domain, $path, $title, $user_login, $user_email, $key, $meta
        ),
        $from_name,
        esc_url( 'http://' . $domain . $path )
    );
    wp_mail( $user_email, wp_specialchars_decode( $subject ), $message, $message_headers );

    if ( $switched_locale ) {
        restore_previous_locale();
    }

    return true;
}

/**
 * Send a confirmation request email to a user when they sign up for a new user account (without signing up for a site
 * at the same time). The user account will not become active until the confirmation link is clicked.
 *
 * This is the notification function used when no new site has
 * been requested.
 *
 * Filter {@see 'wpmu_signup_user_notification'} to bypass this function or
 * replace it with your own notification behavior.
 *
 * Filter {@see 'wpmu_signup_user_notification_email'} and
 * {@see 'wpmu_signup_user_notification_subject'} to change the content
 * and subject line of the email sent to newly registered users.
 *
 * @since MU (3.0.0)
 *
 * @param string $user_login The user's login name.
 * @param string $user_email The user's email address.
 * @param string $key        The activation key created in wpmu_signup_user()
 * @param array  $meta       Optional. Signup meta data. Default empty array.
 * @return bool
 */
function wpmu_signup_user_notification( $user_login, $user_email, $key, $meta = array() ) {
    /**
     * Filters whether to bypass the email notification for new user sign-up.
     *
     * @since MU (3.0.0)
     *
     * @param string $user_login User login name.
     * @param string $user_email User email address.
     * @param string $key        Activation key created in wpmu_signup_user().
     * @param array  $meta       Signup meta data. Default empty array.
     */
    if ( ! apply_filters( 'wpmu_signup_user_notification', $user_login, $user_email, $key, $meta ) )
        return false;

    $user = get_user_by( 'login', $user_login );
    $switched_locale = switch_to_locale( get_user_locale( $user ) );

    // Send email with activation link.
    $admin_email = get_site_option( 'admin_email' );
    if ( $admin_email == '' )
        $admin_email = 'support@' . $_SERVER['SERVER_NAME'];
    $from_name = get_site_option( 'site_name' ) == '' ? 'WordPress' : esc_html( get_site_option( 'site_name' ) );
    $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n";
    $message = sprintf(
        /**
         * Filters the content of the notification email for new user sign-up.
         *
         * Content should be formatted for transmission via wp_mail().
         *
         * @since MU (3.0.0)
         *
         * @param string $content    Content of the notification email.
         * @param string $user_login User login name.
         * @param string $user_email User email address.
         * @param string $key        Activation key created in wpmu_signup_user().
         * @param array  $meta       Signup meta data. Default empty array.
         */
        apply_filters( 'wpmu_signup_user_notification_email',
            __( "To activate your user, please click the following link:\n\n%s\n\nAfter you activate, you will receive *another email* with your login." ),
            $user_login, $user_email, $key, $meta
        ),
        site_url( "wp-activate.php?key=$key" )
    );
    // TODO: Don't hard code activation link.
    $subject = sprintf(
        /**
         * Filters the subject of the notification email of new user signup.
         *
         * @since MU (3.0.0)
         *
         * @param string $subject    Subject of the notification email.
         * @param string $user_login User login name.
         * @param string $user_email User email address.
         * @param string $key        Activation key created in wpmu_signup_user().
         * @param array  $meta       Signup meta data. Default empty array.
         */
        apply_filters( 'wpmu_signup_user_notification_subject',
            /* translators: New user notification email subject. 1: Network name, 2: New user login */
            _x( '[%1$s] Activate %2$s', 'New user notification email subject' ),
            $user_login, $user_email, $key, $meta
        ),
        $from_name,
        $user_login
    );
    wp_mail( $user_email, wp_specialchars_decode( $subject ), $message, $message_headers );

    if ( $switched_locale ) {
        restore_previous_locale();
    }

    return true;
}

/**
 * Activate a signup.
 *
 * Hook to {@see 'wpmu_activate_user'} or {@see 'wpmu_activate_blog'} for events
 * that should happen only when users or sites are self-created (since
 * those actions are not called when users and sites are created
 * by a Super Admin).
 *
 * @since MU (3.0.0)
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $key The activation key provided to the user.
 * @return array|WP_Error An array containing information about the activated user and/or blog
 */
function wpmu_activate_signup($key) {
    global $wpdb;

    $signup = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->signups WHERE activation_key = %s", $key) );

    if ( empty( $signup ) )
        return new WP_Error( 'invalid_key', __( 'Invalid activation key.' ) );

    if ( $signup->active ) {
        if ( empty( $signup->domain ) )
            return new WP_Error( 'already_active', __( 'The user is already active.' ), $signup );
        else
            return new WP_Error( 'already_active', __( 'The site is already active.' ), $signup );
    }

    $meta = maybe_unserialize($signup->meta);
    $password = wp_generate_password( 12, false );

    $user_id = username_exists($signup->user_login);

    if ( ! $user_id )
        $user_id = wpmu_create_user($signup->user_login, $password, $signup->user_email);
    else
        $user_already_exists = true;

    if ( ! $user_id )
        return new WP_Error('create_user', __('Could not create user'), $signup);

    $now = current_time('mysql', true);

    if ( empty($signup->domain) ) {
        $wpdb->update( $wpdb->signups, array('active' => 1, 'activated' => $now), array('activation_key' => $key) );

        if ( isset( $user_already_exists ) )
            return new WP_Error( 'user_already_exists', __( 'That username is already activated.' ), $signup);

        /**
         * Fires immediately after a new user is activated.
         *
         * @since MU (3.0.0)
         *
         * @param int   $user_id  User ID.
         * @param int   $password User password.
         * @param array $meta     Signup meta data.
         */
        do_action( 'wpmu_activate_user', $user_id, $password, $meta );
        return array( 'user_id' => $user_id, 'password' => $password, 'meta' => $meta );
    }

    $blog_id = wpmu_create_blog( $signup->domain, $signup->path, $signup->title, $user_id, $meta, get_current_network_id() );

    // TODO: What to do if we create a user but cannot create a blog?
    if ( is_wp_error($blog_id) ) {
        // If blog is taken, that means a previous attempt to activate this blog failed in between creating the blog and
        // setting the activation flag. Let's just set the active flag and instruct the user to reset their password.
        if ( 'blog_taken' == $blog_id->get_error_code() ) {
            $blog_id->add_data( $signup );
            $wpdb->update( $wpdb->signups, array( 'active' => 1, 'activated' => $now ), array( 'activation_key' => $key ) );
        }
        return $blog_id;
    }

    $wpdb->update( $wpdb->signups, array('active' => 1, 'activated' => $now), array('activation_key' => $key) );
    /**
     * Fires immediately after a site is activated.
     *
     * @since MU (3.0.0)
     *
     * @param int    $blog_id       Blog ID.
     * @param int    $user_id       User ID.
     * @param int    $password      User password.
     * @param string $signup_title  Site title.
     * @param array  $meta          Signup meta data. By default, contains the requested privacy setting and lang_id.
     */
    do_action( 'wpmu_activate_blog', $blog_id, $user_id, $password, $signup->title, $meta );

    return array('blog_id' => $blog_id, 'user_id' => $user_id, 'password' => $password, 'title' => $signup->title, 'meta' => $meta);
}

/**
 * Create a user.
 *
 * This function runs when a user self-registers as well as when
 * a Super Admin creates a new user. Hook to {@see 'wpmu_new_user'} for events
 * that should affect all new users, but only on Multisite (otherwise
 * use {@see'user_register'}).
 *
 * @since MU (3.0.0)
 *
 * @param string $user_name The new user's login name.
 * @param string $password  The new user's password.
 * @param string $email     The new user's email address.
 * @return int|false Returns false on failure, or int $user_id on success
 */
function wpmu_create_user( $user_name, $password, $email ) {
    $user_name = preg_replace( '/\s+/', '', sanitize_user( $user_name, true ) );

    $user_id = wp_create_user( $user_name, $password, $email );
    if ( is_wp_error( $user_id ) )
        return false;

    // Newly created users have no roles or caps until they are added to a blog.
    delete_user_option( $user_id, 'capabilities' );
    delete_user_option( $user_id, 'user_level' );

    /**
     * Fires immediately after a new user is created.
     *
     * @since MU (3.0.0)
     *
     * @param int $user_id User ID.
     */
    do_action( 'wpmu_new_user', $user_id );

    return $user_id;
}

/**
 * Create a site.
 *
 * This function runs when a user self-registers a new site as well
 * as when a Super Admin creates a new site. Hook to {@see 'wpmu_new_blog'}
 * for events that should affect all new sites.
 *
 * On subdirectory installations, $domain is the same as the main site's
 * domain, and the path is the subdirectory name (eg 'example.com'
 * and '/blog1/'). On subdomain installations, $domain is the new subdomain +
 * root domain (eg 'blog1.example.com'), and $path is '/'.
 *
 * @since MU (3.0.0)
 *
 * @param string $domain     The new site's domain.
 * @param string $path       The new site's path.
 * @param string $title      The new site's title.
 * @param int    $user_id    The user ID of the new site's admin.
 * @param array  $meta       Optional. Array of key=>value pairs used to set initial site options.
 *                           If valid status keys are included ('public', 'archived', 'mature',
 *                           'spam', 'deleted', or 'lang_id') the given site status(es) will be
 *                           updated. Otherwise, keys and values will be used to set options for
 *                           the new site. Default empty array.
 * @param int    $network_id Optional. Network ID. Only relevant on multi-network installations.
 * @return int|WP_Error Returns WP_Error object on failure, the new site ID on success.
 */
function wpmu_create_blog( $domain, $path, $title, $user_id, $meta = array(), $network_id = 1 ) {
    $defaults = array(
        'public' => 0,
        'WPLANG' => get_network_option( $network_id, 'WPLANG' ),
    );
    $meta = wp_parse_args( $meta, $defaults );

    $domain = preg_replace( '/\s+/', '', sanitize_user( $domain, true ) );

    if ( is_subdomain_install() )
        $domain = str_replace( '@', '', $domain );

    $title = strip_tags( $title );
    $user_id = (int) $user_id;

    if ( empty($path) )
        $path = '/';

    // Check if the domain has been used already. We should return an error message.
    if ( domain_exists($domain, $path, $network_id) )
        return new WP_Error( 'blog_taken', __( 'Sorry, that site already exists!' ) );

    if ( ! wp_installing() ) {
        wp_installing( true );
    }

    if ( ! $blog_id = insert_blog($domain, $path, $network_id) )
        return new WP_Error('insert_blog', __('Could not create site.'));

    switch_to_blog($blog_id);
    install_blog($blog_id, $title);
    wp_install_defaults($user_id);

    add_user_to_blog($blog_id, $user_id, 'administrator');

    foreach ( $meta as $key => $value ) {
        if ( in_array( $key, array( 'public', 'archived', 'mature', 'spam', 'deleted', 'lang_id' ) ) )
            update_blog_status( $blog_id, $key, $value );
        else
            update_option( $key, $value );
    }

    update_option( 'blog_public', (int) $meta['public'] );

    if ( ! is_super_admin( $user_id ) && ! get_user_meta( $user_id, 'primary_blog', true ) )
        update_user_meta( $user_id, 'primary_blog', $blog_id );

    restore_current_blog();
    /**
     * Fires immediately after a new site is created.
     *
     * @since MU (3.0.0)
     *
     * @param int    $blog_id    Site ID.
     * @param int    $user_id    User ID.
     * @param string $domain     Site domain.
     * @param string $path       Site path.
     * @param int    $network_id Network ID. Only relevant on multi-network installations.
     * @param array  $meta       Meta data. Used to set initial site options.
     */
    do_action( 'wpmu_new_blog', $blog_id, $user_id, $domain, $path, $network_id, $meta );

    wp_cache_set( 'last_changed', microtime(), 'sites' );

    return $blog_id;
}

/**
 * Notifies the network admin that a new site has been activated.
 *
 * Filter {@see 'newblog_notify_siteadmin'} to change the content of
 * the notification email.
 *
 * @since MU (3.0.0)
 *
 * @param int    $blog_id    The new site's ID.
 * @param string $deprecated Not used.
 * @return bool
 */
function newblog_notify_siteadmin( $blog_id, $deprecated = '' ) {
    if ( get_site_option( 'registrationnotification' ) != 'yes' )
        return false;

    $email = get_site_option( 'admin_email' );
    if ( is_email($email) == false )
        return false;

    $options_site_url = esc_url(network_admin_url('settings.php'));

    switch_to_blog( $blog_id );
    $blogname = get_option( 'blogname' );
    $siteurl = site_url();
    restore_current_blog();

    /* translators: New site notification email. 1: Site URL, 2: User IP address, 3: Settings screen URL */
    $msg = sprintf( __( 'New Site: %1$s
URL: %2$s
Remote IP address: %3$s

Disable these notifications: %4$s' ), $blogname, $siteurl, wp_unslash( $_SERVER['REMOTE_ADDR'] ), $options_site_url);
    /**
     * Filters the message body of the new site activation email sent
     * to the network administrator.
     *
     * @since MU (3.0.0)
     *
     * @param string $msg Email body.
     */
    $msg = apply_filters( 'newblog_notify_siteadmin', $msg );

    wp_mail( $email, sprintf( __( 'New Site Registration: %s' ), $siteurl ), $msg );
    return true;
}

/**
 * Notifies the network admin that a new user has been activated.
 *
 * Filter {@see 'newuser_notify_siteadmin'} to change the content of
 * the notification email.
 *
 * @since MU (3.0.0)
 *
 * @param int $user_id The new user's ID.
 * @return bool
 */
function newuser_notify_siteadmin( $user_id ) {
    if ( get_site_option( 'registrationnotification' ) != 'yes' )
        return false;

    $email = get_site_option( 'admin_email' );

    if ( is_email($email) == false )
        return false;

    $user = get_userdata( $user_id );

    $options_site_url = esc_url(network_admin_url('settings.php'));
    /* translators: New user notification email. 1: User login, 2: User IP address, 3: Settings screen URL */
    $msg = sprintf(__('New User: %1$s
Remote IP address: %2$s

Disable these notifications: %3$s'), $user->user_login, wp_unslash( $_SERVER['REMOTE_ADDR'] ), $options_site_url);

    /**
     * Filters the message body of the new user activation email sent
     * to the network administrator.
     *
     * @since MU (3.0.0)
     *
     * @param string  $msg  Email body.
     * @param WP_User $user WP_User instance of the new user.
     */
    $msg = apply_filters( 'newuser_notify_siteadmin', $msg, $user );
    wp_mail( $email, sprintf(__('New User Registration: %s'), $user->user_login), $msg );
    return true;
}

/**
 * Checks whether a site name is already taken.
 *
 * The name is the site's subdomain or the site's subdirectory
 * path depending on the network settings.
 *
 * Used during the new site registration process to ensure
 * that each site name is unique.
 *
 * @since MU (3.0.0)
 *
 * @param string $domain     The domain to be checked.
 * @param string $path       The path to be checked.
 * @param int    $network_id Optional. Network ID. Relevant only on multi-network installations.
 * @return int|null The site ID if the site name exists, null otherwise.
 */
function domain_exists( $domain, $path, $network_id = 1 ) {
    $path = trailingslashit( $path );
    $args = array(
        'network_id' => $network_id,
        'domain'     => $domain,
        'path'       => $path,
        'fields'     => 'ids',
        'number'     => 1,
    );
    $result = get_sites( $args );
    $result = array_shift( $result );

    /**
     * Filters whether a site name is taken.
     *
     * The name is the site's subdomain or the site's subdirectory
     * path depending on the network settings.
     *
     * @since 3.5.0
     *
     * @param int|null $result     The site ID if the site name exists, null otherwise.
     * @param string   $domain     Domain to be checked.
     * @param string   $path       Path to be checked.
     * @param int      $network_id Network ID. Relevant only on multi-network installations.
     */
    return apply_filters( 'domain_exists', $result, $domain, $path, $network_id );
}

/**
 * Store basic site info in the blogs table.
 *
 * This function creates a row in the wp_blogs table and returns
 * the new blog's ID. It is the first step in creating a new blog.
 *
 * @since MU (3.0.0)
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $domain     The domain of the new site.
 * @param string $path       The path of the new site.
 * @param int    $network_id Unless you're running a multi-network installation, be sure to set this value to 1.
 * @return int|false The ID of the new row
 */
function insert_blog($domain, $path, $network_id) {
    global $wpdb;

    $path = trailingslashit($path);
    $network_id = (int) $network_id;

    $result = $wpdb->insert( $wpdb->blogs, array('site_id' => $network_id, 'domain' => $domain, 'path' => $path, 'registered' => current_time('mysql')) );
    if ( ! $result )
        return false;

    $blog_id = $wpdb->insert_id;
    clean_blog_cache( $blog_id );

    wp_maybe_update_network_site_counts( $network_id );

    return $blog_id;
}

/**
 * Install an empty blog.
 *
 * Creates the new blog tables and options. If calling this function
 * directly, be sure to use switch_to_blog() first, so that $wpdb
 * points to the new blog.
 *
 * @since MU (3.0.0)
 *
 * @global wpdb     $wpdb
 * @global WP_Roles $wp_roles
 *
 * @param int    $blog_id    The value returned by insert_blog().
 * @param string $blog_title The title of the new site.
 */
function install_blog( $blog_id, $blog_title = '' ) {
    global $wpdb, $wp_roles;

    // Cast for security
    $blog_id = (int) $blog_id;

    require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );

    $suppress = $wpdb->suppress_errors();
    if ( $wpdb->get_results( "DESCRIBE {$wpdb->posts}" ) )
        die( '<h1>' . __( 'Already Installed' ) . '</h1><p>' . __( 'You appear to have already installed WordPress. To reinstall please clear your old database tables first.' ) . '</p></body></html>' );
    $wpdb->suppress_errors( $suppress );

    $url = get_blogaddress_by_id( $blog_id );

    // Set everything up
    make_db_current_silent( 'blog' );
    populate_options();
    populate_roles();

    // populate_roles() clears previous role definitions so we start over.
    $wp_roles = new WP_Roles();

    $siteurl = $home = untrailingslashit( $url );

    if ( ! is_subdomain_install() ) {

         if ( 'https' === parse_url( get_site_option( 'siteurl' ), PHP_URL_SCHEME ) ) {
             $siteurl = set_url_scheme( $siteurl, 'https' );
         }
         if ( 'https' === parse_url( get_home_url( get_network()->site_id ), PHP_URL_SCHEME ) ) {
             $home = set_url_scheme( $home, 'https' );
         }

    }

    update_option( 'siteurl', $siteurl );
    update_option( 'home', $home );

    if ( get_site_option( 'ms_files_rewriting' ) )
        update_option( 'upload_path', UPLOADBLOGSDIR . "/$blog_id/files" );
    else
        update_option( 'upload_path', get_blog_option( get_network()->site_id, 'upload_path' ) );

    update_option( 'blogname', wp_unslash( $blog_title ) );
    update_option( 'admin_email', '' );

    // remove all perms
    $table_prefix = $wpdb->get_blog_prefix();
    delete_metadata( 'user', 0, $table_prefix . 'user_level',   null, true ); // delete all
    delete_metadata( 'user', 0, $table_prefix . 'capabilities', null, true ); // delete all
}

/**
 * Set blog defaults.
 *
 * This function creates a row in the wp_blogs table.
 *
 * @since MU (3.0.0)
 * @deprecated MU
 * @deprecated Use wp_install_defaults()
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int $blog_id Ignored in this function.
 * @param int $user_id
 */
function install_blog_defaults($blog_id, $user_id) {
    global $wpdb;

    require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );

    $suppress = $wpdb->suppress_errors();

    wp_install_defaults($user_id);

    $wpdb->suppress_errors( $suppress );
}

/**
 * Notify a user that their blog activation has been successful.
 *
 * Filter {@see 'wpmu_welcome_notification'} to disable or bypass.
 *
 * Filter {@see 'update_welcome_email'} and {@see 'update_welcome_subject'} to
 * modify the content and subject line of the notification email.
 *
 * @since MU (3.0.0)
 *
 * @param int    $blog_id  Blog ID.
 * @param int    $user_id  User ID.
 * @param string $password User password.
 * @param string $title    Site title.
 * @param array  $meta     Optional. Signup meta data. By default, contains the requested privacy setting and lang_id.
 * @return bool
 */
function wpmu_welcome_notification( $blog_id, $user_id, $password, $title, $meta = array() ) {
    $current_network = get_network();

    /**
     * Filters whether to bypass the welcome email after site activation.
     *
     * Returning false disables the welcome email.
     *
     * @since MU (3.0.0)
     *
     * @param int|bool $blog_id  Blog ID.
     * @param int      $user_id  User ID.
     * @param string   $password User password.
     * @param string   $title    Site title.
     * @param array    $meta     Signup meta data. By default, contains the requested privacy setting and lang_id.
     */
    if ( ! apply_filters( 'wpmu_welcome_notification', $blog_id, $user_id, $password, $title, $meta ) )
        return false;

    $user = get_userdata( $user_id );

    $switched_locale = switch_to_locale( get_user_locale( $user ) );

    $welcome_email = get_site_option( 'welcome_email' );
    if ( $welcome_email == false ) {
        /* translators: Do not translate USERNAME, SITE_NAME, BLOG_URL, PASSWORD: those are placeholders. */
        $welcome_email = __( 'Howdy USERNAME,

Your new SITE_NAME site has been successfully set up at:
BLOG_URL

You can log in to the administrator account with the following information:

Username: USERNAME
Password: PASSWORD
Log in here: BLOG_URLwp-login.php

We hope you enjoy your new site. Thanks!

--The Team @ SITE_NAME' );
    }

    $url = get_blogaddress_by_id($blog_id);

    $welcome_email = str_replace( 'SITE_NAME', $current_network->site_name, $welcome_email );
    $welcome_email = str_replace( 'BLOG_TITLE', $title, $welcome_email );
    $welcome_email = str_replace( 'BLOG_URL', $url, $welcome_email );
    $welcome_email = str_replace( 'USERNAME', $user->user_login, $welcome_email );
    $welcome_email = str_replace( 'PASSWORD', $password, $welcome_email );

    /**
     * Filters the content of the welcome email after site activation.
     *
     * Content should be formatted for transmission via wp_mail().
     *
     * @since MU (3.0.0)
     *
     * @param string $welcome_email Message body of the email.
     * @param int    $blog_id       Blog ID.
     * @param int    $user_id       User ID.
     * @param string $password      User password.
     * @param string $title         Site title.
     * @param array  $meta          Signup meta data. By default, contains the requested privacy setting and lang_id.
     */
    $welcome_email = apply_filters( 'update_welcome_email', $welcome_email, $blog_id, $user_id, $password, $title, $meta );
    $admin_email = get_site_option( 'admin_email' );

    if ( $admin_email == '' )
        $admin_email = 'support@' . $_SERVER['SERVER_NAME'];

    $from_name = get_site_option( 'site_name' ) == '' ? 'WordPress' : esc_html( get_site_option( 'site_name' ) );
    $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n";
    $message = $welcome_email;

    if ( empty( $current_network->site_name ) )
        $current_network->site_name = 'WordPress';

    /* translators: New site notification email subject. 1: Network name, 2: New site name */
    $subject = __( 'New %1$s Site: %2$s' );

    /**
     * Filters the subject of the welcome email after site activation.
     *
     * @since MU (3.0.0)
     *
     * @param string $subject Subject of the email.
     */
    $subject = apply_filters( 'update_welcome_subject', sprintf( $subject, $current_network->site_name, wp_unslash( $title ) ) );
    wp_mail( $user->user_email, wp_specialchars_decode( $subject ), $message, $message_headers );

    if ( $switched_locale ) {
        restore_previous_locale();
    }

    return true;
}

/**
 * Notify a user that their account activation has been successful.
 *
 * Filter {@see 'wpmu_welcome_user_notification'} to disable or bypass.
 *
 * Filter {@see 'update_welcome_user_email'} and {@see 'update_welcome_user_subject'} to
 * modify the content and subject line of the notification email.
 *
 * @since MU (3.0.0)
 *
 * @param int    $user_id  User ID.
 * @param string $password User password.
 * @param array  $meta     Optional. Signup meta data. Default empty array.
 * @return bool
 */
function wpmu_welcome_user_notification( $user_id, $password, $meta = array() ) {
    $current_network = get_network();

    /**
      * Filters whether to bypass the welcome email after user activation.
     *
     * Returning false disables the welcome email.
     *
     * @since MU (3.0.0)
     *
     * @param int    $user_id  User ID.
     * @param string $password User password.
     * @param array  $meta     Signup meta data. Default empty array.
     */
    if ( ! apply_filters( 'wpmu_welcome_user_notification', $user_id, $password, $meta ) )
        return false;

    $welcome_email = get_site_option( 'welcome_user_email' );

    $user = get_userdata( $user_id );

    $switched_locale = switch_to_locale( get_user_locale( $user ) );

    /**
     * Filters the content of the welcome email after user activation.
     *
     * Content should be formatted for transmission via wp_mail().
     *
     * @since MU (3.0.0)
     *
     * @param string $welcome_email The message body of the account activation success email.
     * @param int    $user_id       User ID.
     * @param string $password      User password.
     * @param array  $meta          Signup meta data. Default empty array.
     */
    $welcome_email = apply_filters( 'update_welcome_user_email', $welcome_email, $user_id, $password, $meta );
    $welcome_email = str_replace( 'SITE_NAME', $current_network->site_name, $welcome_email );
    $welcome_email = str_replace( 'USERNAME', $user->user_login, $welcome_email );
    $welcome_email = str_replace( 'PASSWORD', $password, $welcome_email );
    $welcome_email = str_replace( 'LOGINLINK', wp_login_url(), $welcome_email );

    $admin_email = get_site_option( 'admin_email' );

    if ( $admin_email == '' )
        $admin_email = 'support@' . $_SERVER['SERVER_NAME'];

    $from_name = get_site_option( 'site_name' ) == '' ? 'WordPress' : esc_html( get_site_option( 'site_name' ) );
    $message_headers = "From: \"{$from_name}\" <{$admin_email}>\n" . "Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n";
    $message = $welcome_email;

    if ( empty( $current_network->site_name ) )
        $current_network->site_name = 'WordPress';

    /* translators: New user notification email subject. 1: Network name, 2: New user login */
    $subject = __( 'New %1$s User: %2$s' );

    /**
     * Filters the subject of the welcome email after user activation.
     *
     * @since MU (3.0.0)
     *
     * @param string $subject Subject of the email.
     */
    $subject = apply_filters( 'update_welcome_user_subject', sprintf( $subject, $current_network->site_name, $user->user_login) );
    wp_mail( $user->user_email, wp_specialchars_decode( $subject ), $message, $message_headers );

    if ( $switched_locale ) {
        restore_previous_locale();
    }

    return true;
}

/**
 * Get the current network.
 *
 * Returns an object containing the 'id', 'domain', 'path', and 'site_name'
 * properties of the network being viewed.
 *
 * @see wpmu_current_site()
 *
 * @since MU (3.0.0)
 *
 * @global WP_Network $current_site
 *
 * @return WP_Network
 */
function get_current_site() {
    global $current_site;
    return $current_site;
}

/**
 * Get a user's most recent post.
 *
 * Walks through each of a user's blogs to find the post with
 * the most recent post_date_gmt.
 *
 * @since MU (3.0.0)
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int $user_id
 * @return array Contains the blog_id, post_id, post_date_gmt, and post_gmt_ts
 */
function get_most_recent_post_of_user( $user_id ) {
    global $wpdb;

    $user_blogs = get_blogs_of_user( (int) $user_id );
    $most_recent_post = array();

    // Walk through each blog and get the most recent post
    // published by $user_id
    foreach ( (array) $user_blogs as $blog ) {
        $prefix = $wpdb->get_blog_prefix( $blog->userblog_id );
        $recent_post = $wpdb->get_row( $wpdb->prepare("SELECT ID, post_date_gmt FROM {$prefix}posts WHERE post_author = %d AND post_type = 'post' AND post_status = 'publish' ORDER BY post_date_gmt DESC LIMIT 1", $user_id ), ARRAY_A);

        // Make sure we found a post
        if ( isset($recent_post['ID']) ) {
            $post_gmt_ts = strtotime($recent_post['post_date_gmt']);

            // If this is the first post checked or if this post is
            // newer than the current recent post, make it the new
            // most recent post.
            if ( !isset($most_recent_post['post_gmt_ts']) || ( $post_gmt_ts > $most_recent_post['post_gmt_ts'] ) ) {
                $most_recent_post = array(
                    'blog_id'        => $blog->userblog_id,
                    'post_id'        => $recent_post['ID'],
                    'post_date_gmt'    => $recent_post['post_date_gmt'],
                    'post_gmt_ts'    => $post_gmt_ts
                );
            }
        }
    }

    return $most_recent_post;
}

// Misc functions

/**
 * Get the size of a directory.
 *
 * A helper function that is used primarily to check whether
 * a blog has exceeded its allowed upload space.
 *
 * @since MU (3.0.0)
 *
 * @param string $directory Full path of a directory.
 * @return int Size of the directory in MB.
 */
function get_dirsize( $directory ) {
    $dirsize = get_transient( 'dirsize_cache' );
    if ( is_array( $dirsize ) && isset( $dirsize[ $directory ][ 'size' ] ) )
        return $dirsize[ $directory ][ 'size' ];

    if ( ! is_array( $dirsize ) )
        $dirsize = array();

    // Exclude individual site directories from the total when checking the main site,
    // as they are subdirectories and should not be counted.
    if ( is_main_site() ) {
        $dirsize[ $directory ][ 'size' ] = recurse_dirsize( $directory, $directory . '/sites' );
    } else {
        $dirsize[ $directory ][ 'size' ] = recurse_dirsize( $directory );
    }

    set_transient( 'dirsize_cache', $dirsize, HOUR_IN_SECONDS );
    return $dirsize[ $directory ][ 'size' ];
}

/**
 * Get the size of a directory recursively.
 *
 * Used by get_dirsize() to get a directory's size when it contains
 * other directories.
 *
 * @since MU (3.0.0)
 * @since 4.3.0 $exclude parameter added.
 *
 * @param string $directory Full path of a directory.
 * @param string $exclude   Optional. Full path of a subdirectory to exclude from the total.
 * @return int|false Size in MB if a valid directory. False if not.
 */
function recurse_dirsize( $directory, $exclude = null ) {
    $size = 0;

    $directory = untrailingslashit( $directory );

    if ( ! file_exists( $directory ) || ! is_dir( $directory ) || ! is_readable( $directory ) || $directory === $exclude ) {
        return false;
    }

    if ($handle = opendir($directory)) {
        while(($file = readdir($handle)) !== false) {
            $path = $directory.'/'.$file;
            if ($file != '.' && $file != '..') {
                if (is_file($path)) {
                    $size += filesize($path);
                } elseif (is_dir($path)) {
                    $handlesize = recurse_dirsize( $path, $exclude );
                    if ($handlesize > 0)
                        $size += $handlesize;
                }
            }
        }
        closedir($handle);
    }
    return $size;
}

/**
 * Check an array of MIME types against a whitelist.
 *
 * WordPress ships with a set of allowed upload filetypes,
 * which is defined in wp-includes/functions.php in
 * get_allowed_mime_types(). This function is used to filter
 * that list against the filetype whitelist provided by Multisite
 * Super Admins at wp-admin/network/settings.php.
 *
 * @since MU (3.0.0)
 *
 * @param array $mimes
 * @return array
 */
function check_upload_mimes( $mimes ) {
    $site_exts = explode( ' ', get_site_option( 'upload_filetypes', 'jpg jpeg png gif' ) );
    $site_mimes = array();
    foreach ( $site_exts as $ext ) {
        foreach ( $mimes as $ext_pattern => $mime ) {
            if ( $ext != '' && strpos( $ext_pattern, $ext ) !== false )
                $site_mimes[$ext_pattern] = $mime;
        }
    }
    return $site_mimes;
}

/**
 * Update a blog's post count.
 *
 * WordPress MS stores a blog's post count as an option so as
 * to avoid extraneous COUNTs when a blog's details are fetched
 * with get_site(). This function is called when posts are published
 * or unpublished to make sure the count stays current.
 *
 * @since MU (3.0.0)
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $deprecated Not used.
 */
function update_posts_count( $deprecated = '' ) {
    global $wpdb;
    update_option( 'post_count', (int) $wpdb->get_var( "SELECT COUNT(ID) FROM {$wpdb->posts} WHERE post_status = 'publish' and post_type = 'post'" ) );
}

/**
 * Logs the user email, IP, and registration date of a new site.
 *
 * @since MU (3.0.0)
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int $blog_id
 * @param int $user_id
 */
function wpmu_log_new_registrations( $blog_id, $user_id ) {
    global $wpdb;
    $user = get_userdata( (int) $user_id );
    if ( $user )
        $wpdb->insert( $wpdb->registration_log, array('email' => $user->user_email, 'IP' => preg_replace( '/[^0-9., ]/', '', wp_unslash( $_SERVER['REMOTE_ADDR'] ) ), 'blog_id' => $blog_id, 'date_registered' => current_time('mysql')) );
}

/**
 * Maintains a canonical list of terms by syncing terms created for each blog with the global terms table.
 *
 * @since 3.0.0
 *
 * @see term_id_filter
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 * @staticvar int $global_terms_recurse
 *
 * @param int    $term_id    An ID for a term on the current blog.
 * @param string $deprecated Not used.
 * @return int An ID from the global terms table mapped from $term_id.
 */
function global_terms( $term_id, $deprecated = '' ) {
    global $wpdb;
    static $global_terms_recurse = null;

    if ( !global_terms_enabled() )
        return $term_id;

    // prevent a race condition
    $recurse_start = false;
    if ( $global_terms_recurse === null ) {
        $recurse_start = true;
        $global_terms_recurse = 1;
    } elseif ( 10 < $global_terms_recurse++ ) {
        return $term_id;
    }

    $term_id = intval( $term_id );
    $c = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->terms WHERE term_id = %d", $term_id ) );

    $global_id = $wpdb->get_var( $wpdb->prepare( "SELECT cat_ID FROM $wpdb->sitecategories WHERE category_nicename = %s", $c->slug ) );
    if ( $global_id == null ) {
        $used_global_id = $wpdb->get_var( $wpdb->prepare( "SELECT cat_ID FROM $wpdb->sitecategories WHERE cat_ID = %d", $c->term_id ) );
        if ( null == $used_global_id ) {
            $wpdb->insert( $wpdb->sitecategories, array( 'cat_ID' => $term_id, 'cat_name' => $c->name, 'category_nicename' => $c->slug ) );
            $global_id = $wpdb->insert_id;
            if ( empty( $global_id ) )
                return $term_id;
        } else {
            $max_global_id = $wpdb->get_var( "SELECT MAX(cat_ID) FROM $wpdb->sitecategories" );
            $max_local_id = $wpdb->get_var( "SELECT MAX(term_id) FROM $wpdb->terms" );
            $new_global_id = max( $max_global_id, $max_local_id ) + mt_rand( 100, 400 );
            $wpdb->insert( $wpdb->sitecategories, array( 'cat_ID' => $new_global_id, 'cat_name' => $c->name, 'category_nicename' => $c->slug ) );
            $global_id = $wpdb->insert_id;
        }
    } elseif ( $global_id != $term_id ) {
        $local_id = $wpdb->get_var( $wpdb->prepare( "SELECT term_id FROM $wpdb->terms WHERE term_id = %d", $global_id ) );
        if ( null != $local_id ) {
            global_terms( $local_id );
            if ( 10 < $global_terms_recurse ) {
                $global_id = $term_id;
            }
        }
    }

    if ( $global_id != $term_id ) {
        if ( get_option( 'default_category' ) == $term_id )
            update_option( 'default_category', $global_id );

        $wpdb->update( $wpdb->terms, array('term_id' => $global_id), array('term_id' => $term_id) );
        $wpdb->update( $wpdb->term_taxonomy, array('term_id' => $global_id), array('term_id' => $term_id) );
        $wpdb->update( $wpdb->term_taxonomy, array('parent' => $global_id), array('parent' => $term_id) );

        clean_term_cache($term_id);
    }
    if ( $recurse_start )
        $global_terms_recurse = null;

    return $global_id;
}

/**
 * Ensure that the current site's domain is listed in the allowed redirect host list.
 *
 * @see wp_validate_redirect()
 * @since MU (3.0.0)
 *
 * @param array|string $deprecated Not used.
 * @return array The current site's domain
 */
function redirect_this_site( $deprecated = '' ) {
    return array( get_network()->domain );
}

/**
 * Check whether an upload is too big.
 *
 * @since MU (3.0.0)
 *
 * @blessed
 *
 * @param array $upload
 * @return string|array If the upload is under the size limit, $upload is returned. Otherwise returns an error message.
 */
function upload_is_file_too_big( $upload ) {
    if ( ! is_array( $upload ) || defined( 'WP_IMPORTING' ) || get_site_option( 'upload_space_check_disabled' ) )
        return $upload;

    if ( strlen( $upload['bits'] )  > ( KB_IN_BYTES * get_site_option( 'fileupload_maxk', 1500 ) ) ) {
        return sprintf( __( 'This file is too big. Files must be less than %d KB in size.' ) . '<br />', get_site_option( 'fileupload_maxk', 1500 ) );
    }

    return $upload;
}

/**
 * Add a nonce field to the signup page.
 *
 * @since MU (3.0.0)
 */
function signup_nonce_fields() {
    $id = mt_rand();
    echo "<input type='hidden' name='signup_form_id' value='{$id}' />";
    wp_nonce_field('signup_form_' . $id, '_signup_form', false);
}

/**
 * Process the signup nonce created in signup_nonce_fields().
 *
 * @since MU (3.0.0)
 *
 * @param array $result
 * @return array
 */
function signup_nonce_check( $result ) {
    if ( !strpos( $_SERVER[ 'PHP_SELF' ], 'wp-signup.php' ) )
        return $result;

    if ( wp_create_nonce('signup_form_' . $_POST[ 'signup_form_id' ]) != $_POST['_signup_form'] )
        wp_die( __( 'Please try again.' ) );

    return $result;
}

/**
 * Correct 404 redirects when NOBLOGREDIRECT is defined.
 *
 * @since MU (3.0.0)
 */
function maybe_redirect_404() {
    /**
     * Filters the redirect URL for 404s on the main site.
     *
     * The filter is only evaluated if the NOBLOGREDIRECT constant is defined.
     *
     * @since 3.0.0
     *
     * @param string $no_blog_redirect The redirect URL defined in NOBLOGREDIRECT.
     */
    if ( is_main_site() && is_404() && defined( 'NOBLOGREDIRECT' ) && ( $destination = apply_filters( 'blog_redirect_404', NOBLOGREDIRECT ) ) ) {
        if ( $destination == '%siteurl%' )
            $destination = network_home_url();
        wp_redirect( $destination );
        exit();
    }
}

/**
 * Add a new user to a blog by visiting /newbloguser/{key}/.
 *
 * This will only work when the user's details are saved as an option
 * keyed as 'new_user_{key}', where '{key}' is a hash generated for the user to be
 * added, as when a user is invited through the regular WP Add User interface.
 *
 * @since MU (3.0.0)
 */
function maybe_add_existing_user_to_blog() {
    if ( false === strpos( $_SERVER[ 'REQUEST_URI' ], '/newbloguser/' ) )
        return;

    $parts = explode( '/', $_SERVER[ 'REQUEST_URI' ] );
    $key = array_pop( $parts );

    if ( $key == '' )
        $key = array_pop( $parts );

    $details = get_option( 'new_user_' . $key );
    if ( !empty( $details ) )
        delete_option( 'new_user_' . $key );

    if ( empty( $details ) || is_wp_error( add_existing_user_to_blog( $details ) ) )
        wp_die( sprintf(__('An error occurred adding you to this site. Back to the <a href="%s">homepage</a>.'), home_url() ) );

    wp_die( sprintf( __( 'You have been added to this site. Please visit the <a href="%s">homepage</a> or <a href="%s">log in</a> using your username and password.' ), home_url(), admin_url() ), __( 'WordPress › Success' ), array( 'response' => 200 ) );
}

/**
 * Add a user to a blog based on details from maybe_add_existing_user_to_blog().
 *
 * @since MU (3.0.0)
 *
 * @param array $details
 * @return true|WP_Error|void
 */
function add_existing_user_to_blog( $details = false ) {
    if ( is_array( $details ) ) {
        $blog_id = get_current_blog_id();
        $result = add_user_to_blog( $blog_id, $details[ 'user_id' ], $details[ 'role' ] );

        /**
         * Fires immediately after an existing user is added to a site.
         *
         * @since MU (3.0.0)
         *
         * @param int   $user_id User ID.
         * @param mixed $result  True on success or a WP_Error object if the user doesn't exist
         *                       or could not be added.
         */
        do_action( 'added_existing_user', $details['user_id'], $result );

        return $result;
    }
}

/**
 * Adds a newly created user to the appropriate blog
 *
 * To add a user in general, use add_user_to_blog(). This function
 * is specifically hooked into the {@see 'wpmu_activate_user'} action.
 *
 * @since MU (3.0.0)
 * @see add_user_to_blog()
 *
 * @param int   $user_id
 * @param mixed $password Ignored.
 * @param array $meta
 */
function add_new_user_to_blog( $user_id, $password, $meta ) {
    if ( !empty( $meta[ 'add_to_blog' ] ) ) {
        $blog_id = $meta[ 'add_to_blog' ];
        $role = $meta[ 'new_role' ];
        remove_user_from_blog( $user_id, get_network()->site_id ); // remove user from main blog.

        $result = add_user_to_blog( $blog_id, $user_id, $role );

        if ( ! is_wp_error( $result ) ) {
            update_user_meta( $user_id, 'primary_blog', $blog_id );
        }
    }
}

/**
 * Correct From host on outgoing mail to match the site domain
 *
 * @since MU (3.0.0)
 *
 * @param PHPMailer $phpmailer The PHPMailer instance (passed by reference).
 */
function fix_phpmailer_messageid( $phpmailer ) {
    $phpmailer->Hostname = get_network()->domain;
}

/**
 * Check to see whether a user is marked as a spammer, based on user login.
 *
 * @since MU (3.0.0)
 *
 * @param string|WP_User $user Optional. Defaults to current user. WP_User object,
 *                                or user login name as a string.
 * @return bool
 */
function is_user_spammy( $user = null ) {
    if ( ! ( $user instanceof WP_User ) ) {
        if ( $user ) {
            $user = get_user_by( 'login', $user );
        } else {
            $user = wp_get_current_user();
        }
    }

    return $user && isset( $user->spam ) && 1 == $user->spam;
}

/**
 * Update this blog's 'public' setting in the global blogs table.
 *
 * Public blogs have a setting of 1, private blogs are 0.
 *
 * @since MU (3.0.0)
 *
 * @param int $old_value
 * @param int $value     The new public value
 */
function update_blog_public( $old_value, $value ) {
    update_blog_status( get_current_blog_id(), 'public', (int) $value );
}

/**
 * Check whether users can self-register, based on Network settings.
 *
 * @since MU (3.0.0)
 *
 * @return bool
 */
function users_can_register_signup_filter() {
    $registration = get_site_option('registration');
    return ( $registration == 'all' || $registration == 'user' );
}

/**
 * Ensure that the welcome message is not empty. Currently unused.
 *
 * @since MU (3.0.0)
 *
 * @param string $text
 * @return string
 */
function welcome_user_msg_filter( $text ) {
    if ( !$text ) {
        remove_filter( 'site_option_welcome_user_email', 'welcome_user_msg_filter' );

        /* translators: Do not translate USERNAME, PASSWORD, LOGINLINK, SITE_NAME: those are placeholders. */
        $text = __( 'Howdy USERNAME,

Your new account is set up.

You can log in with the following information:
Username: USERNAME
Password: PASSWORD
LOGINLINK

Thanks!

--The Team @ SITE_NAME' );
        update_site_option( 'welcome_user_email', $text );
    }
    return $text;
}

/**
 * Whether to force SSL on content.
 *
 * @since 2.8.5
 *
 * @staticvar bool $forced_content
 *
 * @param bool $force
 * @return bool True if forced, false if not forced.
 */
function force_ssl_content( $force = '' ) {
    static $forced_content = false;

    if ( '' != $force ) {
        $old_forced = $forced_content;
        $forced_content = $force;
        return $old_forced;
    }

    return $forced_content;
}

/**
 * Formats a URL to use https.
 *
 * Useful as a filter.
 *
 * @since 2.8.5
 *
 * @param string $url URL
 * @return string URL with https as the scheme
 */
function filter_SSL( $url ) {
    if ( ! is_string( $url ) )
        return get_bloginfo( 'url' ); // Return home blog url with proper scheme

    if ( force_ssl_content() && is_ssl() )
        $url = set_url_scheme( $url, 'https' );

    return $url;
}

/**
 * Schedule update of the network-wide counts for the current network.
 *
 * @since 3.1.0
 */
function wp_schedule_update_network_counts() {
    if ( !is_main_site() )
        return;

    if ( ! wp_next_scheduled('update_network_counts') && ! wp_installing() )
        wp_schedule_event(time(), 'twicedaily', 'update_network_counts');
}

/**
 * Update the network-wide counts for the current network.
 *
 * @since 3.1.0
 * @since 4.8.0 The $network_id parameter has been added.
 *
 * @param int|null $network_id ID of the network. Default is the current network.
 */
function wp_update_network_counts( $network_id = null ) {
    wp_update_network_user_counts( $network_id );
    wp_update_network_site_counts( $network_id );
}

/**
 * Update the count of sites for the current network.
 *
 * If enabled through the {@see 'enable_live_network_counts'} filter, update the sites count
 * on a network when a site is created or its status is updated.
 *
 * @since 3.7.0
 * @since 4.8.0 The $network_id parameter has been added.
 *
 * @param int|null $network_id ID of the network. Default is the current network.
 */
function wp_maybe_update_network_site_counts( $network_id = null ) {
    $is_small_network = ! wp_is_large_network( 'sites', $network_id );

    /**
     * Filters whether to update network site or user counts when a new site is created.
     *
     * @since 3.7.0
     *
     * @see wp_is_large_network()
     *
     * @param bool   $small_network Whether the network is considered small.
     * @param string $context       Context. Either 'users' or 'sites'.
     */
    if ( ! apply_filters( 'enable_live_network_counts', $is_small_network, 'sites' ) )
        return;

    wp_update_network_site_counts( $network_id );
}

/**
 * Update the network-wide users count.
 *
 * If enabled through the {@see 'enable_live_network_counts'} filter, update the users count
 * on a network when a user is created or its status is updated.
 *
 * @since 3.7.0
 * @since 4.8.0 The $network_id parameter has been added.
 *
 * @param int|null $network_id ID of the network. Default is the current network.
 */
function wp_maybe_update_network_user_counts( $network_id = null ) {
    $is_small_network = ! wp_is_large_network( 'users', $network_id );

    /** This filter is documented in wp-includes/ms-functions.php */
    if ( ! apply_filters( 'enable_live_network_counts', $is_small_network, 'users' ) )
        return;

    wp_update_network_user_counts( $network_id );
}

/**
 * Update the network-wide site count.
 *
 * @since 3.7.0
 * @since 4.8.0 The $network_id parameter has been added.
 *
 * @param int|null $network_id ID of the network. Default is the current network.
 */
function wp_update_network_site_counts( $network_id = null ) {
    $network_id = (int) $network_id;
    if ( ! $network_id ) {
        $network_id = get_current_network_id();
    }

    $count = get_sites( array(
        'network_id' => $network_id,
        'spam'       => 0,
        'deleted'    => 0,
        'archived'   => 0,
        'count'      => true,
    ) );

    update_network_option( $network_id, 'blog_count', $count );
}

/**
 * Update the network-wide user count.
 *
 * @since 3.7.0
 * @since 4.8.0 The $network_id parameter has been added.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param int|null $network_id ID of the network. Default is the current network.
 */
function wp_update_network_user_counts( $network_id = null ) {
    global $wpdb;

    $count = $wpdb->get_var( "SELECT COUNT(ID) as c FROM $wpdb->users WHERE spam = '0' AND deleted = '0'" );
    update_network_option( $network_id, 'user_count', $count );
}

/**
 * Returns the space used by the current blog.
 *
 * @since 3.5.0
 *
 * @return int Used space in megabytes
 */
function get_space_used() {
    /**
     * Filters the amount of storage space used by the current site.
     *
     * @since 3.5.0
     *
     * @param int|bool $space_used The amount of used space, in megabytes. Default false.
     */
    $space_used = apply_filters( 'pre_get_space_used', false );
    if ( false === $space_used ) {
        $upload_dir = wp_upload_dir();
        $space_used = get_dirsize( $upload_dir['basedir'] ) / MB_IN_BYTES;
    }

    return $space_used;
}

/**
 * Returns the upload quota for the current blog.
 *
 * @since MU (3.0.0)
 *
 * @return int Quota in megabytes
 */
function get_space_allowed() {
    $space_allowed = get_option( 'blog_upload_space' );

    if ( ! is_numeric( $space_allowed ) )
        $space_allowed = get_site_option( 'blog_upload_space' );

    if ( ! is_numeric( $space_allowed ) )
        $space_allowed = 100;

    /**
     * Filters the upload quota for the current site.
     *
     * @since 3.7.0
     *
     * @param int $space_allowed Upload quota in megabytes for the current blog.
     */
    return apply_filters( 'get_space_allowed', $space_allowed );
}

/**
 * Determines if there is any upload space left in the current blog's quota.
 *
 * @since 3.0.0
 *
 * @return int of upload space available in bytes
 */
function get_upload_space_available() {
    $allowed = get_space_allowed();
    if ( $allowed < 0 ) {
        $allowed = 0;
    }
    $space_allowed = $allowed * MB_IN_BYTES;
    if ( get_site_option( 'upload_space_check_disabled' ) )
        return $space_allowed;

    $space_used = get_space_used() * MB_IN_BYTES;

    if ( ( $space_allowed - $space_used ) <= 0 )
        return 0;

    return $space_allowed - $space_used;
}

/**
 * Determines if there is any upload space left in the current blog's quota.
 *
 * @since 3.0.0
 * @return bool True if space is available, false otherwise.
 */
function is_upload_space_available() {
    if ( get_site_option( 'upload_space_check_disabled' ) )
        return true;

    return (bool) get_upload_space_available();
}

/**
 * Filters the maximum upload file size allowed, in bytes.
 *
 * @since 3.0.0
 *
 * @param  int $size Upload size limit in bytes.
 * @return int       Upload size limit in bytes.
 */
function upload_size_limit_filter( $size ) {
    $fileupload_maxk = KB_IN_BYTES * get_site_option( 'fileupload_maxk', 1500 );
    if ( get_site_option( 'upload_space_check_disabled' ) )
        return min( $size, $fileupload_maxk );

    return min( $size, $fileupload_maxk, get_upload_space_available() );
}

/**
 * Whether or not we have a large network.
 *
 * The default criteria for a large network is either more than 10,000 users or more than 10,000 sites.
 * Plugins can alter this criteria using the {@see 'wp_is_large_network'} filter.
 *
 * @since 3.3.0
 * @since 4.8.0 The $network_id parameter has been added.
 *
 * @param string   $using      'sites or 'users'. Default is 'sites'.
 * @param int|null $network_id ID of the network. Default is the current network.
 * @return bool True if the network meets the criteria for large. False otherwise.
 */
function wp_is_large_network( $using = 'sites', $network_id = null ) {
    $network_id = (int) $network_id;
    if ( ! $network_id ) {
        $network_id = get_current_network_id();
    }

    if ( 'users' == $using ) {
        $count = get_user_count( $network_id );
        /**
         * Filters whether the network is considered large.
         *
         * @since 3.3.0
         * @since 4.8.0 The $network_id parameter has been added.
         *
         * @param bool   $is_large_network Whether the network has more than 10000 users or sites.
         * @param string $component        The component to count. Accepts 'users', or 'sites'.
         * @param int    $count            The count of items for the component.
         * @param int    $network_id       The ID of the network being checked.
         */
        return apply_filters( 'wp_is_large_network', $count > 10000, 'users', $count, $network_id );
    }

    $count = get_blog_count( $network_id );
    /** This filter is documented in wp-includes/ms-functions.php */
    return apply_filters( 'wp_is_large_network', $count > 10000, 'sites', $count, $network_id );
}

/**
 * Retrieves a list of reserved site on a sub-directory Multisite installation.
 *
 * @since 4.4.0
 *
 * @return array $names Array of reserved subdirectory names.
 */
function get_subdirectory_reserved_names() {
    $names = array(
        'page', 'comments', 'blog', 'files', 'feed', 'wp-admin',
        'wp-content', 'wp-includes', 'wp-json', 'embed'
    );

    /**
     * Filters reserved site names on a sub-directory Multisite installation.
     *
     * @since 3.0.0
     * @since 4.4.0 'wp-admin', 'wp-content', 'wp-includes', 'wp-json', and 'embed' were added
     *              to the reserved names list.
     *
     * @param array $subdirectory_reserved_names Array of reserved names.
     */
    return apply_filters( 'subdirectory_reserved_names', $names );
}

/**
 * Send a confirmation request email when a change of network admin email address is attempted.
 *
 * The new network admin address will not become active until confirmed.
 *
 * @since 4.9.0
 *
 * @param string $old_value The old network admin email address.
 * @param string $value     The proposed new network admin email address.
 */
function update_network_option_new_admin_email( $old_value, $value ) {
    if ( $value == get_site_option( 'admin_email' ) || ! is_email( $value ) ) {
        return;
    }

    $hash = md5( $value . time() . mt_rand() );
    $new_admin_email = array(
        'hash'     => $hash,
        'newemail' => $value,
    );
    update_site_option( 'network_admin_hash', $new_admin_email );

    $switched_locale = switch_to_locale( get_user_locale() );

    /* translators: Do not translate USERNAME, ADMIN_URL, EMAIL, SITENAME, SITEURL: those are placeholders. */
    $email_text = __( 'Howdy ###USERNAME###,

You recently requested to have the network admin email address on
your network changed.

If this is correct, please click on the following link to change it:
###ADMIN_URL###

You can safely ignore and delete this email if you do not want to
take this action.

This email has been sent to ###EMAIL###

Regards,
All at ###SITENAME###
###SITEURL###' );

    /**
     * Filters the text of the email sent when a change of network admin email address is attempted.
     *
     * The following strings have a special meaning and will get replaced dynamically:
     * ###USERNAME###  The current user's username.
     * ###ADMIN_URL### The link to click on to confirm the email change.
     * ###EMAIL###     The proposed new network admin email address.
     * ###SITENAME###  The name of the network.
     * ###SITEURL###   The URL to the network.
     *
     * @since 4.9.0
     *
     * @param string $email_text      Text in the email.
     * @param array  $new_admin_email {
     *     Data relating to the new network admin email address.
     *
     *     @type string $hash     The secure hash used in the confirmation link URL.
     *     @type string $newemail The proposed new network admin email address.
     * }
     */
    $content = apply_filters( 'new_network_admin_email_content', $email_text, $new_admin_email );

    $current_user = wp_get_current_user();
    $content = str_replace( '###USERNAME###', $current_user->user_login, $content );
    $content = str_replace( '###ADMIN_URL###', esc_url( network_admin_url( 'settings.php?network_admin_hash=' . $hash ) ), $content );
    $content = str_replace( '###EMAIL###', $value, $content );
    $content = str_replace( '###SITENAME###', wp_specialchars_decode( get_site_option( 'site_name' ), ENT_QUOTES ), $content );
    $content = str_replace( '###SITEURL###', network_home_url(), $content );

    wp_mail( $value, sprintf( __( '[%s] New Network Admin Email Address' ), wp_specialchars_decode( get_site_option( 'site_name' ), ENT_QUOTES ) ), $content );

    if ( $switched_locale ) {
        restore_previous_locale();
    }
}

/**
 * Send an email to the old network admin email address when the network admin email address changes.
 *
 * @since 4.9.0
 *
 * @param string $option_name The relevant database option name.
 * @param string $new_email   The new network admin email address.
 * @param string $old_email   The old network admin email address.
 * @param int    $network_id  ID of the network.
 */
function wp_network_admin_email_change_notification( $option_name, $new_email, $old_email, $network_id ) {
    $send = true;

    // Don't send the notification to the default 'admin_email' value.
    if ( '[e-mail]' === $old_email ) {
        $send = false;
    }

    /**
     * Filters whether to send the network admin email change notification email.
     *
     * @since 4.9.0
     *
     * @param bool   $send       Whether to send the email notification.
     * @param string $old_email  The old network admin email address.
     * @param string $new_email  The new network admin email address.
     * @param int    $network_id ID of the network.
     */
    $send = apply_filters( 'send_network_admin_email_change_email', $send, $old_email, $new_email, $network_id );

    if ( ! $send ) {
        return;
    }

    /* translators: Do not translate OLD_EMAIL, NEW_EMAIL, SITENAME, SITEURL: those are placeholders. */
    $email_change_text = __( 'Hi,

This notice confirms that the network admin email address was changed on ###SITENAME###.

The new network admin email address is ###NEW_EMAIL###.

This email has been sent to ###OLD_EMAIL###

Regards,
All at ###SITENAME###
###SITEURL###' );

    $email_change_email = array(
        'to'      => $old_email,
        /* translators: Network admin email change notification email subject. %s: Network title */
        'subject' => __( '[%s] Notice of Network Admin Email Change' ),
        'message' => $email_change_text,
        'headers' => '',
    );
    // get network name
    $network_name = wp_specialchars_decode( get_site_option( 'site_name' ), ENT_QUOTES );

    /**
     * Filters the contents of the email notification sent when the network admin email address is changed.
     *
     * @since 4.9.0
     *
     * @param array $email_change_email {
     *            Used to build wp_mail().
     *
     *            @type string $to      The intended recipient.
     *            @type string $subject The subject of the email.
     *            @type string $message The content of the email.
     *                The following strings have a special meaning and will get replaced dynamically:
     *                - ###OLD_EMAIL### The old network admin email address.
     *                - ###NEW_EMAIL### The new network admin email address.
     *                - ###SITENAME###  The name of the network.
     *                - ###SITEURL###   The URL to the site.
     *            @type string $headers Headers.
     *        }
     * @param string $old_email  The old network admin email address.
     * @param string $new_email  The new network admin email address.
     * @param int    $network_id ID of the network.
     */
    $email_change_email = apply_filters( 'network_admin_email_change_email', $email_change_email, $old_email, $new_email, $network_id );

    $email_change_email['message'] = str_replace( '###OLD_EMAIL###', $old_email,    $email_change_email['message'] );
    $email_change_email['message'] = str_replace( '###NEW_EMAIL###', $new_email,    $email_change_email['message'] );
    $email_change_email['message'] = str_replace( '###SITENAME###',  $network_name, $email_change_email['message'] );
    $email_change_email['message'] = str_replace( '###SITEURL###',   home_url(),    $email_change_email['message'] );

    wp_mail( $email_change_email['to'], sprintf(
        $email_change_email['subject'],
        $network_name
    ), $email_change_email['message'], $email_change_email['headers'] );
}