Cricao de Sites - 650 Layouts Prontos/WebMasters.iso/Blogs/wordpress2.6.exe/wordpress2.6/wp-includes/taxonomy.php

PHP Script | 2008-08-06 | 67.7 KB | 2,157 lines

<?php
/**
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 */

//
// Taxonomy Registration
//

/**
 * Default Taxonomy Objects
 * @since 2.3
 * @global array $wp_taxonomies
 */
$wp_taxonomies = array();
$wp_taxonomies['category'] = (object) array('name' => 'category', 'object_type' => 'post', 'hierarchical' => true, 'update_count_callback' => '_update_post_term_count');
$wp_taxonomies['post_tag'] = (object) array('name' => 'post_tag', 'object_type' => 'post', 'hierarchical' => false, 'update_count_callback' => '_update_post_term_count');
$wp_taxonomies['link_category'] = (object) array('name' => 'link_category', 'object_type' => 'link', 'hierarchical' => false);

/**
 * Return all of the taxonomy names that are of $object_type.
 *
 * It appears that this function can be used to find all of the names inside of
 * $wp_taxonomies global variable.
 *
 * <code><?php $taxonomies = get_object_taxonomies('post'); ?></code> Should
 * result in <code>Array('category', 'post_tag')</code>
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses $wp_taxonomies
 *
 * @param array|string|object $object Name of the type of taxonomy object, or an object (row from posts)
 * @return array The names of all taxonomy of $object_type.
 */
function get_object_taxonomies($object) {
    global $wp_taxonomies;

    if ( is_object($object) ) {
        if ( $object->post_type == 'attachment' )
            return get_attachment_taxonomies($object);
        $object = $object->post_type;
    }

    $object = (array) $object;

    $taxonomies = array();
    foreach ( $wp_taxonomies as $taxonomy ) {
        if ( array_intersect($object, (array) $taxonomy->object_type) )
            $taxonomies[] = $taxonomy->name;
    }

    return $taxonomies;
}

/**
 * Retrieves the taxonomy object of $taxonomy.
 *
 * The get_taxonomy function will first check that the parameter string given
 * is a taxonomy object and if it is, it will return it.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses $wp_taxonomies
 * @uses is_taxonomy() Checks whether taxonomy exists
 *
 * @param string $taxonomy Name of taxonomy object to return
 * @return object|bool The Taxonomy Object or false if $taxonomy doesn't exist
 */
function get_taxonomy( $taxonomy ) {
    global $wp_taxonomies;

    if ( ! is_taxonomy($taxonomy) )
        return false;

    return $wp_taxonomies[$taxonomy];
}

/**
 * Checks that the taxonomy name exists.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses $wp_taxonomies
 *
 * @param string $taxonomy Name of taxonomy object
 * @return bool Whether the taxonomy exists or not.
 */
function is_taxonomy( $taxonomy ) {
    global $wp_taxonomies;

    return isset($wp_taxonomies[$taxonomy]);
}

/**
 * Whether the taxonomy object is hierarchical.
 *
 * Checks to make sure that the taxonomy is an object first. Then Gets the
 * object, and finally returns the hierarchical value in the object.
 *
 * A false return value might also mean that the taxonomy does not exist.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses is_taxonomy() Checks whether taxonomy exists
 * @uses get_taxonomy() Used to get the taxonomy object
 *
 * @param string $taxonomy Name of taxonomy object
 * @return bool Whether the taxonomy is hierarchical
 */
function is_taxonomy_hierarchical($taxonomy) {
    if ( ! is_taxonomy($taxonomy) )
        return false;

    $taxonomy = get_taxonomy($taxonomy);
    return $taxonomy->hierarchical;
}

/**
 * Create or modify a taxonomy object. Do not use before init.
 *
 * A simple function for creating or modifying a taxonomy object based on the
 * parameters given. The function will accept an array (third optional
 * parameter), along with strings for the taxonomy name and another string for
 * the object type.
 *
 * Nothing is returned, so expect error maybe or use is_taxonomy() to check
 * whether taxonomy exists.
 *
 * Optional $args contents:
 *
 * hierarachical - has some defined purpose at other parts of the API and is a
 * boolean value.
 *
 * update_count_callback - works much like a hook, in that it will be called
 * when the count is updated.
 *
 * rewrite - false to prevent rewrite, or array('slug'=>$slug) to customize
 * permastruct; default will use $taxonomy as slug.
 *
 * query_var - false to prevent queries, or string to customize query var
 * (?$query_var=$term); default will use $taxonomy as query var.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 * @uses $wp_taxonomies Inserts new taxonomy object into the list
 * @uses $wp_rewrite Adds rewrite tags and permastructs
 * @uses $wp Adds query vars
 *
 * @param string $taxonomy Name of taxonomy object
 * @param array|string $object_type Name of the object type for the taxonomy object.
 * @param array|string $args See above description for the two keys values.
 */
function register_taxonomy( $taxonomy, $object_type, $args = array() ) {
    global $wp_taxonomies, $wp_rewrite, $wp;

    $defaults = array('hierarchical' => false, 'update_count_callback' => '', 'rewrite' => true, 'query_var' => true);
    $args = wp_parse_args($args, $defaults);

    if ( false !== $args['query_var'] && !empty($wp) ) {
        if ( true === $args['query_var'] )
            $args['query_var'] = $taxonomy;
        $args['query_var'] = sanitize_title_with_dashes($args['query_var']);
        $wp->add_query_var($args['query_var']);
    }

    if ( false !== $args['rewrite'] && !empty($wp_rewrite) ) {
        if ( !is_array($args['rewrite']) )
            $args['rewrite'] = array();
        if ( !isset($args['rewrite']['slug']) )
            $args['rewrite']['slug'] = sanitize_title_with_dashes($taxonomy);
        $wp_rewrite->add_rewrite_tag("%$taxonomy%", '([^/]+)', $args['query_var'] ? "{$args['query_var']}=" : "taxonomy=$taxonomy&term=$term");
        $wp_rewrite->add_permastruct($taxonomy, "{$args['rewrite']['slug']}/%$taxonomy%");
    }

    $args['name'] = $taxonomy;
    $args['object_type'] = $object_type;
    $wp_taxonomies[$taxonomy] = (object) $args;
}

//
// Term API
//

/**
 * Retrieve object_ids of valid taxonomy and term.
 *
 * The strings of $taxonomies must exist before this function will continue. On
 * failure of finding a valid taxonomy, it will return an WP_Error class, kind
 * of like Exceptions in PHP 5, except you can't catch them. Even so, you can
 * still test for the WP_Error class and get the error message.
 *
 * The $terms aren't checked the same as $taxonomies, but still need to exist
 * for $object_ids to be returned.
 *
 * It is possible to change the order that object_ids is returned by either
 * using PHP sort family functions or using the database by using $args with
 * either ASC or DESC array. The value should be in the key named 'order'.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses $wpdb
 * @uses wp_parse_args() Creates an array from string $args.
 *
 * @param string|array $terms String of term or array of string values of terms that will be used
 * @param string|array $taxonomies String of taxonomy name or Array of string values of taxonomy names
 * @param array|string $args Change the order of the object_ids, either ASC or DESC
 * @return WP_Error|array If the taxonomy does not exist, then WP_Error will be returned. On success
 *    the array can be empty meaning that there are no $object_ids found or it will return the $object_ids found.
 */
function get_objects_in_term( $terms, $taxonomies, $args = array() ) {
    global $wpdb;

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

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

    foreach ( $taxonomies as $taxonomy ) {
        if ( ! is_taxonomy($taxonomy) )
            return new WP_Error('invalid_taxonomy', __('Invalid Taxonomy'));
    }

    $defaults = array('order' => 'ASC');
    $args = wp_parse_args( $args, $defaults );
    extract($args, EXTR_SKIP);

    $order = ( 'desc' == strtolower($order) ) ? 'DESC' : 'ASC';

    $terms = array_map('intval', $terms);

    $taxonomies = "'" . implode("', '", $taxonomies) . "'";
    $terms = "'" . implode("', '", $terms) . "'";

    $object_ids = $wpdb->get_col("SELECT tr.object_id FROM $wpdb->term_relationships AS tr INNER JOIN $wpdb->term_taxonomy AS tt ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ($taxonomies) AND tt.term_id IN ($terms) ORDER BY tr.object_id $order");

    if ( ! $object_ids )
        return array();

    return $object_ids;
}

/**
 * Get all Term data from database by Term ID.
 *
 * The usage of the get_term function is to apply filters to a term object. It
 * is possible to get a term object from the database before applying the
 * filters.
 *
 * $term ID must be part of $taxonomy, to get from the database. Failure, might
 * be able to be captured by the hooks. Failure would be the same value as $wpdb
 * returns for the get_row method.
 *
 * There are two hooks, one is specifically for each term, named 'get_term', and
 * the second is for the taxonomy name, 'term_$taxonomy'. Both hooks gets the
 * term object, and the taxonomy name as parameters. Both hooks are expected to
 * return a Term object.
 *
 * 'get_term' hook - Takes two parameters the term Object and the taxonomy name.
 * Must return term object. Used in get_term() as a catch-all filter for every
 * $term.
 *
 * 'get_$taxonomy' hook - Takes two parameters the term Object and the taxonomy
 * name. Must return term object. $taxonomy will be the taxonomy name, so for
 * example, if 'category', it would be 'get_category' as the filter name. Useful
 * for custom taxonomies or plugging into default taxonomies.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses $wpdb
 * @uses sanitize_term() Cleanses the term based on $filter context before returning.
 * @see sanitize_term_field() The $context param lists the available values for get_term_by() $filter param.
 *
 * @param int|object $term If integer, will get from database. If object will apply filters and return $term.
 * @param string $taxonomy Taxonomy name that $term is part of.
 * @param string $output Constant OBJECT, ARRAY_A, or ARRAY_N
 * @param string $filter Optional, default is raw or no WordPress defined filter will applied.
 * @return mixed|null|WP_Error Term Row from database. Will return null if $term is empty. If taxonomy does not
 * exist then WP_Error will be returned.
 */
function &get_term($term, $taxonomy, $output = OBJECT, $filter = 'raw') {
    global $wpdb;

    if ( empty($term) )
        return null;

    if ( ! is_taxonomy($taxonomy) )
        return new WP_Error('invalid_taxonomy', __('Invalid Taxonomy'));

    if ( is_object($term) ) {
        wp_cache_add($term->term_id, $term, $taxonomy);
        $_term = $term;
    } else {
        $term = (int) $term;
        if ( ! $_term = wp_cache_get($term, $taxonomy) ) {
            $_term = $wpdb->get_row( $wpdb->prepare( "SELECT t.*, tt.* FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id WHERE tt.taxonomy = %s AND t.term_id = %s LIMIT 1", $taxonomy, $term) );
            wp_cache_add($term, $_term, $taxonomy);
        }
    }

    $_term = apply_filters('get_term', $_term, $taxonomy);
    $_term = apply_filters("get_$taxonomy", $_term, $taxonomy);
    $_term = sanitize_term($_term, $taxonomy, $filter);

    if ( $output == OBJECT ) {
        return $_term;
    } elseif ( $output == ARRAY_A ) {
        return get_object_vars($_term);
    } elseif ( $output == ARRAY_N ) {
        return array_values(get_object_vars($_term));
    } else {
        return $_term;
    }
}

/**
 * Get all Term data from database by Term field and data.
 *
 * Warning: $value is not escaped for 'name' $field. You must do it yourself, if
 * required.
 *
 * The default $field is 'id', therefore it is possible to also use null for
 * field, but not recommended that you do so.
 *
 * If $value does not exist, the return value will be false. If $taxonomy exists
 * and $field and $value combinations exist, the Term will be returned.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses $wpdb
 * @uses sanitize_term() Cleanses the term based on $filter context before returning.
 * @see sanitize_term_field() The $context param lists the available values for get_term_by() $filter param.
 *
 * @param string $field Either 'slug', 'name', or 'id'
 * @param string|int $value Search for this term value
 * @param string $taxonomy Taxonomy Name
 * @param string $output Constant OBJECT, ARRAY_A, or ARRAY_N
 * @param string $filter Optional, default is raw or no WordPress defined filter will applied.
 * @return mixed Term Row from database. Will return false if $taxonomy does not exist or $term was not found.
 */
function get_term_by($field, $value, $taxonomy, $output = OBJECT, $filter = 'raw') {
    global $wpdb;

    if ( ! is_taxonomy($taxonomy) )
        return false;

    if ( 'slug' == $field ) {
        $field = 't.slug';
        $value = sanitize_title($value);
        if ( empty($value) )
            return false;
    } else if ( 'name' == $field ) {
        // Assume already escaped
        $field = 't.name';
    } else {
        $field = 't.term_id';
        $value = (int) $value;
    }

    $term = $wpdb->get_row( $wpdb->prepare( "SELECT t.*, tt.* FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id WHERE tt.taxonomy = %s AND $field = %s LIMIT 1", $taxonomy, $value) );
    if ( !$term )
        return false;

    wp_cache_add($term->term_id, $term, $taxonomy);

    $term = sanitize_term($term, $taxonomy, $filter);

    if ( $output == OBJECT ) {
        return $term;
    } elseif ( $output == ARRAY_A ) {
        return get_object_vars($term);
    } elseif ( $output == ARRAY_N ) {
        return array_values(get_object_vars($term));
    } else {
        return $term;
    }
}

/**
 * Merge all term children into a single array.
 *
 * This recursive function will merge all of the children of $term into the same
 * array. Only useful for taxonomies which are hierarchical.
 *
 * Will return an empty array if $term does not exist in $taxonomy.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses $wpdb
 * @uses _get_term_hierarchy()
 * @uses get_term_children() Used to get the children of both $taxonomy and the parent $term
 *
 * @param string $term Name of Term to get children
 * @param string $taxonomy Taxonomy Name
 * @return array|WP_Error List of Term Objects. WP_Error returned if $taxonomy does not exist
 */
function get_term_children( $term, $taxonomy ) {
    if ( ! is_taxonomy($taxonomy) )
        return new WP_Error('invalid_taxonomy', __('Invalid Taxonomy'));

    $terms = _get_term_hierarchy($taxonomy);

    if ( ! isset($terms[$term]) )
        return array();

    $children = $terms[$term];

    foreach ( $terms[$term] as $child ) {
        if ( isset($terms[$child]) )
            $children = array_merge($children, get_term_children($child, $taxonomy));
    }

    return $children;
}

/**
 * Get sanitized Term field.
 *
 * Does checks for $term, based on the $taxonomy. The function is for contextual
 * reasons and for simplicity of usage. See sanitize_term_field() for more
 * information.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses sanitize_term_field() Passes the return value in sanitize_term_field on success.
 *
 * @param string $field Term field to fetch
 * @param int $term Term ID
 * @param string $taxonomy Taxonomy Name
 * @param string $context Optional, default is display. Look at sanitize_term_field() for available options.
 * @return mixed Will return an empty string if $term is not an object or if $field is not set in $term.
 */
function get_term_field( $field, $term, $taxonomy, $context = 'display' ) {
    $term = (int) $term;
    $term = get_term( $term, $taxonomy );
    if ( is_wp_error($term) )
        return $term;

    if ( !is_object($term) )
        return '';

    if ( !isset($term->$field) )
        return '';

    return sanitize_term_field($field, $term->$field, $term->term_id, $taxonomy, $context);
}

/**
 * Sanitizes Term for editing.
 *
 * Return value is sanitize_term() and usage is for sanitizing the term for
 * editing. Function is for contextual and simplicity.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses sanitize_term() Passes the return value on success
 *
 * @param int|object $id Term ID or Object
 * @param string $taxonomy Taxonomy Name
 * @return mixed|null|WP_Error Will return empty string if $term is not an object.
 */
function get_term_to_edit( $id, $taxonomy ) {
    $term = get_term( $id, $taxonomy );

    if ( is_wp_error($term) )
        return $term;

    if ( !is_object($term) )
        return '';

    return sanitize_term($term, $taxonomy, 'edit');
}

/**
 * Retrieve the terms in taxonomy or list of taxonomies.
 *
 * You can fully inject any customizations to the query before it is sent, as
 * well as control the output with a filter.
 *
 * The 'get_terms' filter will be called when the cache has the term and will
 * pass the found term along with the array of $taxonomies and array of $args.
 * This filter is also called before the array of terms is passed and will pass
 * the array of terms, along with the $taxonomies and $args.
 *
 * The 'list_terms_exclusions' filter passes the compiled exclusions along with
 * the $args.
 *
 * The list that $args can contain, which will overwrite the defaults.
 *
 * orderby - Default is 'name'. Can be name, count, or nothing (will use
 * term_id).
 *
 * order - Default is ASC. Can use DESC.
 * hide_empty - Default is true. Will not return empty $terms.
 * fields - Default is all.
 * slug - Any terms that has this value. Default is empty string.
 * hierarchical - Whether to return hierarchical taxonomy. Default is true.
 * name__like - Default is empty string.
 *
 * The argument 'pad_counts' will count all of the children along with the
 * $terms.
 *
 * The 'get' argument allows for overwriting 'hide_empty' and 'child_of', which
 * can be done by setting the value to 'all', instead of its default empty
 * string value.
 *
 * The 'child_of' argument will be used if you use multiple taxonomy or the
 * first $taxonomy isn't hierarchical or 'parent' isn't used. The default is 0,
 * which will be translated to a false value. If 'child_of' is set, then
 * 'child_of' value will be tested against $taxonomy to see if 'child_of' is
 * contained within. Will return an empty array if test fails.
 *
 * If 'parent' is set, then it will be used to test against the first taxonomy.
 * Much like 'child_of'. Will return an empty array if the test fails.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses $wpdb
 * @uses wp_parse_args() Merges the defaults with those defined by $args and allows for strings.
 *
 * @param string|array Taxonomy name or list of Taxonomy names
 * @param string|array $args The values of what to search for when returning terms
 * @return array|WP_Error List of Term Objects and their children. Will return WP_Error, if any of $taxonomies do not exist.
 */
function &get_terms($taxonomies, $args = '') {
    global $wpdb;
    $empty_array = array();

    $single_taxonomy = false;
    if ( !is_array($taxonomies) ) {
        $single_taxonomy = true;
        $taxonomies = array($taxonomies);
    }

    foreach ( $taxonomies as $taxonomy ) {
        if ( ! is_taxonomy($taxonomy) )
            return new WP_Error('invalid_taxonomy', __('Invalid Taxonomy'));
    }

    $in_taxonomies = "'" . implode("', '", $taxonomies) . "'";

    $defaults = array('orderby' => 'name', 'order' => 'ASC',
        'hide_empty' => true, 'exclude' => '', 'include' => '',
        'number' => '', 'fields' => 'all', 'slug' => '', 'parent' => '',
        'hierarchical' => true, 'child_of' => 0, 'get' => '', 'name__like' => '',
        'pad_counts' => false, 'offset' => '', 'search' => '');
    $args = wp_parse_args( $args, $defaults );
    $args['number'] = absint( $args['number'] );
    $args['offset'] = absint( $args['offset'] );
    if ( !$single_taxonomy || !is_taxonomy_hierarchical($taxonomies[0]) ||
        '' != $args['parent'] ) {
        $args['child_of'] = 0;
        $args['hierarchical'] = false;
        $args['pad_counts'] = false;
    }

    if ( 'all' == $args['get'] ) {
        $args['child_of'] = 0;
        $args['hide_empty'] = 0;
        $args['hierarchical'] = false;
        $args['pad_counts'] = false;
    }
    extract($args, EXTR_SKIP);

    if ( $child_of ) {
        $hierarchy = _get_term_hierarchy($taxonomies[0]);
        if ( !isset($hierarchy[$child_of]) )
            return $empty_array;
    }

    if ( $parent ) {
        $hierarchy = _get_term_hierarchy($taxonomies[0]);
        if ( !isset($hierarchy[$parent]) )
            return $empty_array;
    }

    // $args can be whatever, only use the args defined in defaults to compute the key
    $filter_key = ( has_filter('list_terms_exclusions') ) ? serialize($GLOBALS['wp_filter']['list_terms_exclusions']) : '';
    $key = md5( serialize( compact(array_keys($defaults)) ) . serialize( $taxonomies ) . $filter_key );

    if ( $cache = wp_cache_get( 'get_terms', 'terms' ) ) {
        if ( isset( $cache[ $key ] ) )
            return apply_filters('get_terms', $cache[$key], $taxonomies, $args);
    }

    if ( 'count' == $orderby )
        $orderby = 'tt.count';
    else if ( 'name' == $orderby )
        $orderby = 't.name';
    else if ( 'slug' == $orderby )
        $orderby = 't.slug';
    else if ( 'term_group' == $orderby )
        $orderby = 't.term_group';
    else
        $orderby = 't.term_id';

    $where = '';
    $inclusions = '';
    if ( !empty($include) ) {
        $exclude = '';
        $interms = preg_split('/[\s,]+/',$include);
        if ( count($interms) ) {
            foreach ( $interms as $interm ) {
                if (empty($inclusions))
                    $inclusions = ' AND ( t.term_id = ' . intval($interm) . ' ';
                else
                    $inclusions .= ' OR t.term_id = ' . intval($interm) . ' ';
            }
        }
    }

    if ( !empty($inclusions) )
        $inclusions .= ')';
    $where .= $inclusions;

    $exclusions = '';
    if ( !empty($exclude) ) {
        $exterms = preg_split('/[\s,]+/',$exclude);
        if ( count($exterms) ) {
            foreach ( $exterms as $exterm ) {
                if (empty($exclusions))
                    $exclusions = ' AND ( t.term_id <> ' . intval($exterm) . ' ';
                else
                    $exclusions .= ' AND t.term_id <> ' . intval($exterm) . ' ';
            }
        }
    }

    if ( !empty($exclusions) )
        $exclusions .= ')';
    $exclusions = apply_filters('list_terms_exclusions', $exclusions, $args );
    $where .= $exclusions;

    if ( !empty($slug) ) {
        $slug = sanitize_title($slug);
        $where .= " AND t.slug = '$slug'";
    }

    if ( !empty($name__like) )
        $where .= " AND t.name LIKE '{$name__like}%'";

    if ( '' != $parent ) {
        $parent = (int) $parent;
        $where .= " AND tt.parent = '$parent'";
    }

    if ( $hide_empty && !$hierarchical )
        $where .= ' AND tt.count > 0';

    if ( !empty($number) ) {
        if( $offset )
            $number = 'LIMIT ' . $offset . ',' . $number;
        else
            $number = 'LIMIT ' . $number;

    } else
        $number = '';

    if ( !empty($search) ) {
        $search = like_escape($search);
        $where .= " AND (t.name LIKE '%$search%')";
    }

    $select_this = '';
    if ( 'all' == $fields )
        $select_this = 't.*, tt.*';
    else if ( 'ids' == $fields )
        $select_this = 't.term_id';
    else if ( 'names' == $fields )
        $select_this = 't.name';

    $query = "SELECT $select_this FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id WHERE tt.taxonomy IN ($in_taxonomies) $where ORDER BY $orderby $order $number";

    if ( 'all' == $fields ) {
        $terms = $wpdb->get_results($query);
        update_term_cache($terms);
    } else if ( ('ids' == $fields) || ('names' == $fields) ) {
        $terms = $wpdb->get_col($query);
    }

    if ( empty($terms) ) {
        $cache[ $key ] = array();
        wp_cache_set( 'get_terms', $cache, 'terms' );
        return apply_filters('get_terms', array(), $taxonomies, $args);
    }

    if ( $child_of || $hierarchical ) {
        $children = _get_term_hierarchy($taxonomies[0]);
        if ( ! empty($children) )
            $terms = & _get_term_children($child_of, $terms, $taxonomies[0]);
    }

    // Update term counts to include children.
    if ( $pad_counts )
        _pad_term_counts($terms, $taxonomies[0]);

    // Make sure we show empty categories that have children.
    if ( $hierarchical && $hide_empty ) {
        foreach ( $terms as $k => $term ) {
            if ( ! $term->count ) {
                $children = _get_term_children($term->term_id, $terms, $taxonomies[0]);
                foreach ( $children as $child )
                    if ( $child->count )
                        continue 2;

                // It really is empty
                unset($terms[$k]);
            }
        }
    }
    reset ( $terms );

    $cache[ $key ] = $terms;
    wp_cache_set( 'get_terms', $cache, 'terms' );

    $terms = apply_filters('get_terms', $terms, $taxonomies, $args);
    return $terms;
}

/**
 * Check if Term exists.
 *
 * Returns the index of a defined term, or 0 (false) if the term doesn't exist.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses $wpdb
 *
 * @param int|string $term The term to check
 * @param string $taxonomy The taxonomy name to use
 * @return mixed Get the term id or Term Object, if exists.
 */
function is_term($term, $taxonomy = '') {
    global $wpdb;

    $select = "SELECT term_id FROM $wpdb->terms as t WHERE ";
    $tax_select = "SELECT tt.term_id, tt.term_taxonomy_id FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy as tt ON tt.term_id = t.term_id WHERE ";

    if ( is_int($term) ) {
        if ( 0 == $term )
            return 0;
        $where = 't.term_id = %d';
        if ( !empty($taxonomy) )
            return $wpdb->get_row( $wpdb->prepare( $tax_select . $where . " AND tt.taxonomy = %s", $term, $taxonomy ), ARRAY_A );
        else
            return $wpdb->get_var( $wpdb->prepare( $select . $where, $term ) );
    }

    if ( '' === $slug = sanitize_title($term) )
        return 0;

    $where = 't.slug = %s';
    $else_where = 't.name = %s';

    if ( !empty($taxonomy) ) {
        if ( $result = $wpdb->get_row( $wpdb->prepare("SELECT tt.term_id, tt.term_taxonomy_id FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy as tt ON tt.term_id = t.term_id WHERE $where AND tt.taxonomy = %s", $slug, $taxonomy), ARRAY_A) )
            return $result;

        return $wpdb->get_row( $wpdb->prepare("SELECT tt.term_id, tt.term_taxonomy_id FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy as tt ON tt.term_id = t.term_id WHERE $else_where AND tt.taxonomy = %s", $term, $taxonomy), ARRAY_A);
    }

    if ( $result = $wpdb->get_var( $wpdb->prepare("SELECT term_id FROM $wpdb->terms as t WHERE $where", $slug) ) )
        return $result;

    return $wpdb->get_var( $wpdb->prepare("SELECT term_id FROM $wpdb->terms as t WHERE $else_where", $term) );
}

/**
 * Sanitize Term all fields.
 *
 * Relys on sanitize_term_field() to sanitize the term. The difference is that
 * this function will sanitize <strong>all</strong> fields. The context is based
 * on sanitize_term_field().
 *
 * The $term is expected to be either an array or an object.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses sanitize_term_field Used to sanitize all fields in a term
 *
 * @param array|object $term The term to check
 * @param string $taxonomy The taxonomy name to use
 * @param string $context Default is 'display'.
 * @return array|object Term with all fields sanitized
 */
function sanitize_term($term, $taxonomy, $context = 'display') {

    if ( 'raw' == $context )
        return $term;

    $fields = array('term_id', 'name', 'description', 'slug', 'count', 'parent', 'term_group');

    $do_object = false;
    if ( is_object($term) )
        $do_object = true;

    foreach ( $fields as $field ) {
        if ( $do_object )
            $term->$field = sanitize_term_field($field, $term->$field, $term->term_id, $taxonomy, $context);
        else
            $term[$field] = sanitize_term_field($field, $term[$field], $term['term_id'], $taxonomy, $context);
    }

    return $term;
}

/**
 * Cleanse the field value in the term based on the context.
 *
 * Passing a term field value through the function should be assumed to have
 * cleansed the value for whatever context the term field is going to be used.
 *
 * If no context or an unsupported context is given, then default filters will
 * be applied.
 *
 * There are enough filters for each context to support a custom filtering
 * without creating your own filter function. Simply create a function that
 * hooks into the filter you need.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses $wpdb
 *
 * @param string $field Term field to sanitize
 * @param string $value Search for this term value
 * @param int $term_id Term ID
 * @param string $taxonomy Taxonomy Name
 * @param string $context Either edit, db, display, attribute, or js.
 * @return mixed sanitized field
 */
function sanitize_term_field($field, $value, $term_id, $taxonomy, $context) {
    if ( 'parent' == $field  || 'term_id' == $field || 'count' == $field || 'term_group' == $field ) {
        $value = (int) $value;
        if ( $value < 0 )
            $value = 0;
    }

    if ( 'raw' == $context )
        return $value;

    if ( 'edit' == $context ) {
        $value = apply_filters("edit_term_$field", $value, $term_id, $taxonomy);
        $value = apply_filters("edit_${taxonomy}_$field", $value, $term_id);
        if ( 'description' == $field )
            $value = format_to_edit($value);
        else
            $value = attribute_escape($value);
    } else if ( 'db' == $context ) {
        $value = apply_filters("pre_term_$field", $value, $taxonomy);
        $value = apply_filters("pre_${taxonomy}_$field", $value);
        // Back compat filters
        if ( 'slug' == $field )
            $value = apply_filters('pre_category_nicename', $value);

    } else if ( 'rss' == $context ) {
        $value = apply_filters("term_${field}_rss", $value, $taxonomy);
        $value = apply_filters("${taxonomy}_${field}_rss", $value);
    } else {
        // Use display filters by default.
        $value = apply_filters("term_$field", $value, $term_id, $taxonomy, $context);
        $value = apply_filters("${taxonomy}_$field", $value, $term_id, $context);
    }

    if ( 'attribute' == $context )
        $value = attribute_escape($value);
    else if ( 'js' == $context )
        $value = js_escape($value);

    return $value;
}

/**
 * Count how many terms are in Taxonomy.
 *
 * Default $args is 'ignore_empty' which can be <code>'ignore_empty=true'</code>
 * or <code>array('ignore_empty' => true);</code>.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses $wpdb
 * @uses wp_parse_args() Turns strings into arrays and merges defaults into an array.
 *
 * @param string $taxonomy Taxonomy name
 * @param array|string $args Overwrite defaults
 * @return int How many terms are in $taxonomy
 */
function wp_count_terms( $taxonomy, $args = array() ) {
    global $wpdb;

    $defaults = array('ignore_empty' => false);
    $args = wp_parse_args($args, $defaults);
    extract($args, EXTR_SKIP);

    $where = '';
    if ( $ignore_empty )
        $where = 'AND count > 0';

    return $wpdb->get_var( $wpdb->prepare("SELECT COUNT(*) FROM $wpdb->term_taxonomy WHERE taxonomy = %s $where", $taxonomy) );
}

/**
 * Will unlink the term from the taxonomy.
 *
 * Will remove the term's relationship to the taxonomy, not the term or taxonomy
 * itself. The term and taxonomy will still exist. Will require the term's
 * object ID to perform the operation.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 * @uses $wpdb
 *
 * @param int $object_id The term Object Id that refers to the term
 * @param string|array $taxonomy List of Taxonomy Names or single Taxonomy name.
 */
function wp_delete_object_term_relationships( $object_id, $taxonomies ) {
    global $wpdb;

    $object_id = (int) $object_id;

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

    foreach ( $taxonomies as $taxonomy ) {
        $terms = wp_get_object_terms($object_id, $taxonomy, 'fields=tt_ids');
        $in_terms = "'" . implode("', '", $terms) . "'";
        $wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->term_relationships WHERE object_id = %d AND term_taxonomy_id IN ($in_terms)", $object_id) );
        wp_update_term_count($terms, $taxonomy);
    }
}

/**
 * Removes a term from the database.
 *
 * If the term is a parent of other terms, then the children will be updated to
 * that term's parent.
 *
 * The $args 'default' will only override the terms found, if there is only one
 * term found. Any other and the found terms are used.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses $wpdb
 * @uses do_action() Calls both 'delete_term' and 'delete_$taxonomy' action
 *    hooks, passing term object, term id. 'delete_term' gets an additional
 *    parameter with the $taxonomy parameter.
 *
 * @param int $term Term ID
 * @param string $taxonomy Taxonomy Name
 * @param array|string $args Optional. Change 'default' term id and override found term ids.
 * @return bool|WP_Error Returns false if not term; true if completes delete action.
 */
function wp_delete_term( $term, $taxonomy, $args = array() ) {
    global $wpdb;

    $term = (int) $term;

    if ( ! $ids = is_term($term, $taxonomy) )
        return false;
    if ( is_wp_error( $ids ) )
        return $ids;

    $tt_id = $ids['term_taxonomy_id'];

    $defaults = array();
    $args = wp_parse_args($args, $defaults);
    extract($args, EXTR_SKIP);

    if ( isset($default) ) {
        $default = (int) $default;
        if ( ! is_term($default, $taxonomy) )
            unset($default);
    }

    // Update children to point to new parent
    if ( is_taxonomy_hierarchical($taxonomy) ) {
        $term_obj = get_term($term, $taxonomy);
        if ( is_wp_error( $term_obj ) )
            return $term_obj;
        $parent = $term_obj->parent;

        $wpdb->update( $wpdb->term_taxonomy, compact( 'parent' ), array( 'parent' => $term_obj->term_id) + compact( 'taxonomy' ) );
    }

    $objects = $wpdb->get_col( $wpdb->prepare( "SELECT object_id FROM $wpdb->term_relationships WHERE term_taxonomy_id = %d", $tt_id ) );

    foreach ( (array) $objects as $object ) {
        $terms = wp_get_object_terms($object, $taxonomy, 'fields=ids');
        if ( 1 == count($terms) && isset($default) )
            $terms = array($default);
        else
            $terms = array_diff($terms, array($term));
        $terms = array_map('intval', $terms);
        wp_set_object_terms($object, $terms, $taxonomy);
    }

    $wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->term_taxonomy WHERE term_taxonomy_id = %d", $tt_id ) );

    // Delete the term if no taxonomies use it.
    if ( !$wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->term_taxonomy WHERE term_id = %d", $term) ) )
        $wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->terms WHERE term_id = %d", $term) );

    clean_term_cache($term, $taxonomy);

    do_action('delete_term', $term, $tt_id, $taxonomy);
    do_action("delete_$taxonomy", $term, $tt_id);

    return true;
}

/**
 * Retrieves the terms associated with the given object(s), in the supplied taxonomies.
 *
 * The following information has to do the $args parameter and for what can be
 * contained in the string or array of that parameter, if it exists.
 *
 * The first argument is called, 'orderby' and has the default value of 'name'.
 * The other value that is supported is 'count'.
 *
 * The second argument is called, 'order' and has the default value of 'ASC'.
 * The only other value that will be acceptable is 'DESC'.
 *
 * The final argument supported is called, 'fields' and has the default value of
 * 'all'. There are multiple other options that can be used instead. Supported
 * values are as follows: 'all', 'ids', 'names', and finally
 * 'all_with_object_id'.
 *
 * The fields argument also decides what will be returned. If 'all' or
 * 'all_with_object_id' is choosen or the default kept intact, then all matching
 * terms objects will be returned. If either 'ids' or 'names' is used, then an
 * array of all matching term ids or term names will be returned respectively.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 * @uses $wpdb
 *
 * @param int|array $object_id The id of the object(s) to retrieve.
 * @param string|array $taxonomies The taxonomies to retrieve terms from.
 * @param array|string $args Change what is returned
 * @return array|WP_Error The requested term data or empty array if no terms found. WP_Error if $taxonomy does not exist.
 */
function wp_get_object_terms($object_ids, $taxonomies, $args = array()) {
    global $wpdb;

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

    foreach ( $taxonomies as $taxonomy ) {
        if ( ! is_taxonomy($taxonomy) )
            return new WP_Error('invalid_taxonomy', __('Invalid Taxonomy'));
    }

    if ( !is_array($object_ids) )
        $object_ids = array($object_ids);
    $object_ids = array_map('intval', $object_ids);

    $defaults = array('orderby' => 'name', 'order' => 'ASC', 'fields' => 'all');
    $args = wp_parse_args( $args, $defaults );

    $terms = array();
    if ( count($taxonomies) > 1 ) {
        foreach ( $taxonomies as $index => $taxonomy ) {
            $t = get_taxonomy($taxonomy);
            if ( isset($t->args) && is_array($t->args) && $args != array_merge($args, $t->args) ) {
                unset($taxonomies[$index]);
                $terms = array_merge($terms, wp_get_object_terms($object_ids, $taxonomy, array_merge($args, $t->args)));
            }
        }
    } else {
        $t = get_taxonomy($taxonomies[0]);
        if ( isset($t->args) && is_array($t->args) )
            $args = array_merge($args, $t->args);
    }

    extract($args, EXTR_SKIP);

    if ( 'count' == $orderby )
        $orderby = 'tt.count';
    else if ( 'name' == $orderby )
        $orderby = 't.name';
    else if ( 'slug' == $orderby )
        $orderby = 't.slug';
    else if ( 'term_group' == $orderby )
        $orderby = 't.term_group';
    else if ( 'term_order' == $orderby )
        $orderby = 'tr.term_order';
    else
        $orderby = 't.term_id';

    $taxonomies = "'" . implode("', '", $taxonomies) . "'";
    $object_ids = implode(', ', $object_ids);

    $select_this = '';
    if ( 'all' == $fields )
        $select_this = 't.*, tt.*';
    else if ( 'ids' == $fields )
        $select_this = 't.term_id';
    else if ( 'names' == $fields )
        $select_this = 't.name';
    else if ( 'all_with_object_id' == $fields )
        $select_this = 't.*, tt.*, tr.object_id';

    $query = "SELECT $select_this FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN $wpdb->term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ($taxonomies) AND tr.object_id IN ($object_ids) ORDER BY $orderby $order";

    if ( 'all' == $fields || 'all_with_object_id' == $fields ) {
        $terms = array_merge($terms, $wpdb->get_results($query));
        update_term_cache($terms);
    } else if ( 'ids' == $fields || 'names' == $fields ) {
        $terms = array_merge($terms, $wpdb->get_col($query));
    } else if ( 'tt_ids' == $fields ) {
        $terms = $wpdb->get_col("SELECT tr.term_taxonomy_id FROM $wpdb->term_relationships AS tr INNER JOIN $wpdb->term_taxonomy AS tt ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tr.object_id IN ($object_ids) AND tt.taxonomy IN ($taxonomies) ORDER BY tr.term_taxonomy_id $order");
    }

    if ( ! $terms )
        return array();

    return $terms;
}

/**
 * Adds a new term to the database. Optionally marks it as an alias of an existing term.
 *
 * Error handling is assigned for the nonexistance of the $taxonomy and $term
 * parameters before inserting. If both the term id and taxonomy exist
 * previously, then an array will be returned that contains the term id and the
 * contents of what is returned. The keys of the array are 'term_id' and
 * 'term_taxonomy_id' containing numeric values.
 *
 * It is assumed that the term does not yet exist or the above will apply. The
 * term will be first added to the term table and then related to the taxonomy
 * if everything is well. If everything is correct, then several actions will be
 * run prior to a filter and then several actions will be run after the filter
 * is run.
 *
 * The arguments decide how the term is handled based on the $args parameter.
 * The following is a list of the available overrides and the defaults.
 *
 * 'alias_of'. There is no default, but if added, expected is the slug that the
 * term will be an alias of. Expected to be a string.
 *
 * 'description'. There is no default. If exists, will be added to the database
 * along with the term. Expected to be a string.
 *
 * 'parent'. Expected to be numeric and default is 0 (zero). Will assign value
 * of 'parent' to the term.
 *
 * 'slug'. Expected to be a string. There is no default.
 *
 * If 'slug' argument exists then the slug will be checked to see if it is not
 * a valid term. If that check succeeds (it is not a valid term), then it is
 * added and the term id is given. If it fails, then a check is made to whether
 * the taxonomy is hierarchical and the parent argument is not empty. If the
 * second check succeeds, the term will be inserted and the term id will be
 * given.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 * @uses $wpdb
 *
 * @uses do_action() Calls 'create_term' hook with the term id and taxonomy id as parameters.
 * @uses do_action() Calls 'create_$taxonomy' hook with term id and taxonomy id as parameters.
 * @uses apply_filters() Calls 'term_id_filter' hook with term id and taxonomy id as parameters.
 * @uses do_action() Calls 'created_term' hook with the term id and taxonomy id as parameters.
 * @uses do_action() Calls 'created_$taxonomy' hook with term id and taxonomy id as parameters.
 *
 * @param int|string $term The term to add or update.
 * @param string $taxonomy The taxonomy to which to add the term
 * @param array|string $args Change the values of the inserted term
 * @return array|WP_Error The Term ID and Term Taxonomy ID
 */
function wp_insert_term( $term, $taxonomy, $args = array() ) {
    global $wpdb;

    if ( ! is_taxonomy($taxonomy) )
        return new WP_Error('invalid_taxonomy', __('Invalid taxonomy'));

    if ( is_int($term) && 0 == $term )
        return new WP_Error('invalid_term_id', __('Invalid term ID'));

    if ( '' == trim($term) )
        return new WP_Error('empty_term_name', __('A name is required for this term'));

    $defaults = array( 'alias_of' => '', 'description' => '', 'parent' => 0, 'slug' => '');
    $args = wp_parse_args($args, $defaults);
    $args['name'] = $term;
    $args['taxonomy'] = $taxonomy;
    $args = sanitize_term($args, $taxonomy, 'db');
    extract($args, EXTR_SKIP);

    // expected_slashed ($name)
    $name = stripslashes($name);
    $description = stripslashes($description);

    if ( empty($slug) )
        $slug = sanitize_title($name);

    $term_group = 0;
    if ( $alias_of ) {
        $alias = $wpdb->get_row( $wpdb->prepare( "SELECT term_id, term_group FROM $wpdb->terms WHERE slug = %s", $alias_of) );
        if ( $alias->term_group ) {
            // The alias we want is already in a group, so let's use that one.
            $term_group = $alias->term_group;
        } else {
            // The alias isn't in a group, so let's create a new one and firstly add the alias term to it.
            $term_group = $wpdb->get_var("SELECT MAX(term_group) FROM $wpdb->terms") + 1;
            $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->terms SET term_group = %d WHERE term_id = %d", $term_group, $alias->term_id ) );
        }
    }

    if ( ! $term_id = is_term($slug) ) {
        if ( false === $wpdb->insert( $wpdb->terms, compact( 'name', 'slug', 'term_group' ) ) )
            return new WP_Error('db_insert_error', __('Could not insert term into the database'), $wpdb->last_error);
        $term_id = (int) $wpdb->insert_id;
    } else if ( is_taxonomy_hierarchical($taxonomy) && !empty($parent) ) {
        // If the taxonomy supports hierarchy and the term has a parent, make the slug unique
        // by incorporating parent slugs.
        $slug = wp_unique_term_slug($slug, (object) $args);
        if ( false === $wpdb->insert( $wpdb->terms, compact( 'name', 'slug', 'term_group' ) ) )
            return new WP_Error('db_insert_error', __('Could not insert term into the database'), $wpdb->last_error);
        $term_id = (int) $wpdb->insert_id;
    }

    if ( empty($slug) ) {
        $slug = sanitize_title($slug, $term_id);
        $wpdb->update( $wpdb->terms, compact( 'slug' ), compact( 'term_id' ) );
    }

    $tt_id = $wpdb->get_var( $wpdb->prepare( "SELECT tt.term_taxonomy_id FROM $wpdb->term_taxonomy AS tt INNER JOIN $wpdb->terms AS t ON tt.term_id = t.term_id WHERE tt.taxonomy = %s AND t.term_id = %d", $taxonomy, $term_id ) );

    if ( !empty($tt_id) )
        return array('term_id' => $term_id, 'term_taxonomy_id' => $tt_id);

    $wpdb->insert( $wpdb->term_taxonomy, compact( 'term_id', 'taxonomy', 'description', 'parent') + array( 'count' => 0 ) );
    $tt_id = (int) $wpdb->insert_id;

    do_action("create_term", $term_id, $tt_id);
    do_action("create_$taxonomy", $term_id, $tt_id);

    $term_id = apply_filters('term_id_filter', $term_id, $tt_id);

    clean_term_cache($term_id, $taxonomy);

    do_action("created_term", $term_id, $tt_id);
    do_action("created_$taxonomy", $term_id, $tt_id);

    return array('term_id' => $term_id, 'term_taxonomy_id' => $tt_id);
}

/**
 * Create Term and Taxonomy Relationships.
 *
 * Relates an object (post, link etc) to a term and taxonomy type. Creates the
 * term and taxonomy relationship if it doesn't already exist. Creates a term if
 * it doesn't exist (using the slug).
 *
 * A relationship means that the term is grouped in or belongs to the taxonomy.
 * A term has no meaning until it is given context by defining which taxonomy it
 * exists under.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 * @uses $wpdb
 *
 * @param int $object_id The object to relate to.
 * @param array|int|string $term The slug or id of the term.
 * @param array|string $taxonomy The context in which to relate the term to the object.
 * @param bool $append If false will delete difference of terms.
 * @return array|WP_Error Affected Term IDs
 */
function wp_set_object_terms($object_id, $terms, $taxonomy, $append = false) {
    global $wpdb;

    $object_id = (int) $object_id;

    if ( ! is_taxonomy($taxonomy) )
        return new WP_Error('invalid_taxonomy', __('Invalid Taxonomy'));

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

    if ( ! $append )
        $old_terms =  wp_get_object_terms($object_id, $taxonomy, 'fields=tt_ids');

    $tt_ids = array();
    $term_ids = array();

    foreach ($terms as $term) {
        if ( !strlen(trim($term)) )
            continue;

        if ( !$id = is_term($term, $taxonomy) )
            $id = wp_insert_term($term, $taxonomy);
        if ( is_wp_error($id) )
            return $id;
        $term_ids[] = $id['term_id'];
        $id = $id['term_taxonomy_id'];
        $tt_ids[] = $id;

        if ( $wpdb->get_var( $wpdb->prepare( "SELECT term_taxonomy_id FROM $wpdb->term_relationships WHERE object_id = %d AND term_taxonomy_id = %d", $object_id, $id ) ) )
            continue;
        $wpdb->insert( $wpdb->term_relationships, array( 'object_id' => $object_id, 'term_taxonomy_id' => $id ) );
    }

    wp_update_term_count($tt_ids, $taxonomy);

    if ( ! $append ) {
        $delete_terms = array_diff($old_terms, $tt_ids);
        if ( $delete_terms ) {
            $in_delete_terms = "'" . implode("', '", $delete_terms) . "'";
            $wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->term_relationships WHERE object_id = %d AND term_taxonomy_id IN ($in_delete_terms)", $object_id) );
            wp_update_term_count($delete_terms, $taxonomy);
        }
    }

    $t = get_taxonomy($taxonomy);
    if ( ! $append && isset($t->sort) && $t->sort ) {
        $values = array();
        $term_order = 0;
        $final_tt_ids = wp_get_object_terms($object_id, $taxonomy, 'fields=tt_ids');
        foreach ( $tt_ids as $tt_id )
            if ( in_array($tt_id, $final_tt_ids) )
                $values[] = $wpdb->prepare( "(%d, %d, %d)", $object_id, $tt_id, ++$term_order);
        if ( $values )
            $wpdb->query("INSERT INTO $wpdb->term_relationships (object_id, term_taxonomy_id, term_order) VALUES " . join(',', $values) . " ON DUPLICATE KEY UPDATE term_order = VALUES(term_order)");
    }

    return $tt_ids;
}

/**
 * Will make slug unique, if it isn't already.
 *
 * The $slug has to be unique global to every taxonomy, meaning that one
 * taxonomy term can't have a matching slug with another taxonomy term. Each
 * slug has to be globally unique for every taxonomy.
 *
 * The way this works is that if the taxonomy that the term belongs to is
 * heirarchical and has a parent, it will append that parent to the $slug.
 *
 * If that still doesn't return an unique slug, then it try to append a number
 * until it finds a number that is truely unique.
 *
 * The only purpose for $term is for appending a parent, if one exists.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 * @uses $wpdb
 *
 * @param string $slug The string that will be tried for a unique slug
 * @param object $term The term object that the $slug will belong too
 * @return string Will return a true unique slug.
 */
function wp_unique_term_slug($slug, $term) {
    global $wpdb;

    // If the taxonomy supports hierarchy and the term has a parent, make the slug unique
    // by incorporating parent slugs.
    if ( is_taxonomy_hierarchical($term->taxonomy) && !empty($term->parent) ) {
        $the_parent = $term->parent;
        while ( ! empty($the_parent) ) {
            $parent_term = get_term($the_parent, $term->taxonomy);
            if ( is_wp_error($parent_term) || empty($parent_term) )
                break;
                $slug .= '-' . $parent_term->slug;
            if ( empty($parent_term->parent) )
                break;
            $the_parent = $parent_term->parent;
        }
    }

    // If we didn't get a unique slug, try appending a number to make it unique.
    if ( !empty($args['term_id']) )
        $query = $wpdb->prepare( "SELECT slug FROM $wpdb->terms WHERE slug = %s AND term_id != %d", $slug, $args['term_id'] );
    else
        $query = $wpdb->prepare( "SELECT slug FROM $wpdb->terms WHERE slug = %s", $slug );

    if ( $wpdb->get_var( $query ) ) {
        $num = 2;
        do {
            $alt_slug = $slug . "-$num";
            $num++;
            $slug_check = $wpdb->get_var( $wpdb->prepare( "SELECT slug FROM $wpdb->terms WHERE slug = %s", $alt_slug ) );
        } while ( $slug_check );
        $slug = $alt_slug;
    }

    return $slug;
}

/**
 * Update term based on arguments provided.
 *
 * The $args will indiscriminately override all values with the same field name.
 * Care must be taken to not override important information need to update or
 * update will fail (or perhaps create a new term, neither would be acceptable).
 *
 * Defaults will set 'alias_of', 'description', 'parent', and 'slug' if not
 * defined in $args already.
 *
 * 'alias_of' will create a term group, if it doesn't already exist, and update
 * it for the $term.
 *
 * If the 'slug' argument in $args is missing, then the 'name' in $args will be
 * used. It should also be noted that if you set 'slug' and it isn't unique then
 * a WP_Error will be passed back. If you don't pass any slug, then a unique one
 * will be created for you.
 *
 * For what can be overrode in $args, check the term scheme can contain and stay
 * away from the term keys.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses $wpdb
 * @uses do_action() Will call both 'edit_term' and 'edit_$taxonomy' twice.
 * @uses apply_filters() Will call the 'term_id_filter' filter and pass the term
 *    id and taxonomy id.
 *
 * @param int $term The ID of the term
 * @param string $taxonomy The context in which to relate the term to the object.
 * @param array|string $args Overwrite term field values
 * @return array|WP_Error Returns Term ID and Taxonomy Term ID
 */
function wp_update_term( $term, $taxonomy, $args = array() ) {
    global $wpdb;

    if ( ! is_taxonomy($taxonomy) )
        return new WP_Error('invalid_taxonomy', __('Invalid taxonomy'));

    $term_id = (int) $term;

    // First, get all of the original args
    $term = get_term ($term_id, $taxonomy, ARRAY_A);

    // Escape data pulled from DB.
    $term = add_magic_quotes($term);

    // Merge old and new args with new args overwriting old ones.
    $args = array_merge($term, $args);

    $defaults = array( 'alias_of' => '', 'description' => '', 'parent' => 0, 'slug' => '');
    $args = wp_parse_args($args, $defaults);
    $args = sanitize_term($args, $taxonomy, 'db');
    extract($args, EXTR_SKIP);

    // expected_slashed ($name)
    $name = stripslashes($name);
    $description = stripslashes($description);

    if ( '' == trim($name) )
        return new WP_Error('empty_term_name', __('A name is required for this term'));

    $empty_slug = false;
    if ( empty($slug) ) {
        $empty_slug = true;
        $slug = sanitize_title($name);
    }

    if ( $alias_of ) {
        $alias = $wpdb->get_row( $wpdb->prepare( "SELECT term_id, term_group FROM $wpdb->terms WHERE slug = %s", $alias_of) );
        if ( $alias->term_group ) {
            // The alias we want is already in a group, so let's use that one.
            $term_group = $alias->term_group;
        } else {
            // The alias isn't in a group, so let's create a new one and firstly add the alias term to it.
            $term_group = $wpdb->get_var("SELECT MAX(term_group) FROM $wpdb->terms") + 1;
            $wpdb->update( $wpdb->terms, compact('term_group'), array( 'term_id' => $alias->term_id ) );
        }
    }

    // Check for duplicate slug
    $id = $wpdb->get_var( $wpdb->prepare( "SELECT term_id FROM $wpdb->terms WHERE slug = %s", $slug ) );
    if ( $id && ($id != $term_id) ) {
        // If an empty slug was passed or the parent changed, reset the slug to something unique.
        // Otherwise, bail.
        if ( $empty_slug || ( $parent != $term->parent) )
            $slug = wp_unique_term_slug($slug, (object) $args);
        else
            return new WP_Error('duplicate_term_slug', sprintf(__('The slug "%s" is already in use by another term'), $slug));
    }

    $wpdb->update($wpdb->terms, compact( 'name', 'slug', 'term_group' ), compact( 'term_id' ) );

    if ( empty($slug) ) {
        $slug = sanitize_title($name, $term_id);
        $wpdb->update( $wpdb->terms, compact( 'slug' ), compact( 'term_id' ) );
    }

    $tt_id = $wpdb->get_var( $wpdb->prepare( "SELECT tt.term_taxonomy_id FROM $wpdb->term_taxonomy AS tt INNER JOIN $wpdb->terms AS t ON tt.term_id = t.term_id WHERE tt.taxonomy = %s AND t.term_id = %d", $taxonomy, $term_id) );

    $wpdb->update( $wpdb->term_taxonomy, compact( 'term_id', 'taxonomy', 'description', 'parent' ), array( 'term_taxonomy_id' => $tt_id ) );

    do_action("edit_term", $term_id, $tt_id);
    do_action("edit_$taxonomy", $term_id, $tt_id);

    $term_id = apply_filters('term_id_filter', $term_id, $tt_id);

    clean_term_cache($term_id, $taxonomy);

    do_action("edited_term", $term_id, $tt_id);
    do_action("edited_$taxonomy", $term_id, $tt_id);

    return array('term_id' => $term_id, 'term_taxonomy_id' => $tt_id);
}

/**
 * Enable or disable term counting.
 *
 * @since 2.6
 *
 * @param bool $defer Optional.
 * @return bool
 */
function wp_defer_term_counting($defer=NULL) {
    static $_defer = false;

    if ( is_bool($defer) ) {
        $_defer = $defer;
        // flush any deferred counts
        if ( !$defer )
            wp_update_term_count( NULL, NULL, true );
    }

    return $_defer;
}

/**
 * Updates the amount of terms in taxonomy.
 *
 * If there is a taxonomy callback applyed, then it will be called for updating
 * the count.
 *
 * The default action is to count what the amount of terms have the relationship
 * of term ID. Once that is done, then update the database.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 * @uses $wpdb
 *
 * @param int|array $terms The ID of the terms
 * @param string $taxonomy The context of the term.
 * @return bool If no terms will return false, and if successful will return true.
 */
function wp_update_term_count( $terms, $taxonomy, $do_deferred=false ) {
    static $_deferred = array();

    if ( $do_deferred ) {
        foreach ( array_keys($_deferred) as $tax ) {
            wp_update_term_count_now( $_deferred[$tax], $tax );
            unset( $_deferred[$tax] );
        }
    }

    if ( empty($terms) )
        return false;

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

    if ( wp_defer_term_counting() ) {
        if ( !isset($_deferred[$taxonomy]) )
            $_deferred[$taxonomy] = array();
        $_deferred[$taxonomy] = array_unique( array_merge($_deferred[$taxonomy], $terms) );
        return true;
    }

    return wp_update_term_count_now( $terms, $taxonomy );
}

/**
 * Perform term count update immediately.
 *
 * @since 2.6
 *
 * @param array $terms IDs of Terms to update.
 * @param string $taxonomy The context of the term.
 * @return bool Always true when complete.
 */
function wp_update_term_count_now( $terms, $taxonomy ) {
    global $wpdb;

    $terms = array_map('intval', $terms);

    $taxonomy = get_taxonomy($taxonomy);
    if ( !empty($taxonomy->update_count_callback) ) {
        call_user_func($taxonomy->update_count_callback, $terms);
    } else {
        // Default count updater
        foreach ($terms as $term) {
            $count = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->term_relationships WHERE term_taxonomy_id = %d", $term) );
            $wpdb->update( $wpdb->term_taxonomy, compact( 'count' ), array( 'term_taxonomy_id' => $term ) );
        }

    }

    clean_term_cache($terms);

    return true;
}

//
// Cache
//


/**
 * Removes the taxonomy relationship to terms from the cache.
 *
 * Will remove the entire taxonomy relationship containing term $object_id. The
 * term IDs have to exist within the taxonomy $object_type for the deletion to
 * take place.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @see get_object_taxonomies() for more on $object_type
 * @uses do_action() Will call action hook named, 'clean_object_term_cache' after completion.
 *    Passes, function params in same order.
 *
 * @param int|array $object_ids Single or list of term object ID(s)
 * @param array|string $object_type The taxonomy object type
 */
function clean_object_term_cache($object_ids, $object_type) {
    if ( !is_array($object_ids) )
        $object_ids = array($object_ids);

    foreach ( $object_ids as $id )
        foreach ( get_object_taxonomies($object_type) as $taxonomy )
            wp_cache_delete($id, "{$taxonomy}_relationships");

    do_action('clean_object_term_cache', $object_ids, $object_type);
}


/**
 * Will remove all of the term ids from the cache.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 * @uses $wpdb
 *
 * @param int|array $ids Single or list of Term IDs
 * @param string $taxonomy Can be empty and will assume tt_ids, else will use for context.
 */
function clean_term_cache($ids, $taxonomy = '') {
    global $wpdb;

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

    $taxonomies = array();
    // If no taxonomy, assume tt_ids.
    if ( empty($taxonomy) ) {
        $tt_ids = implode(', ', $ids);
        $terms = $wpdb->get_results("SELECT term_id, taxonomy FROM $wpdb->term_taxonomy WHERE term_taxonomy_id IN ($tt_ids)");
        foreach ( (array) $terms as $term ) {
            $taxonomies[] = $term->taxonomy;
            wp_cache_delete($term->term_id, $term->taxonomy);
        }
        $taxonomies = array_unique($taxonomies);
    } else {
        foreach ( $ids as $id ) {
            wp_cache_delete($id, $taxonomy);
        }
        $taxonomies = array($taxonomy);
    }

    foreach ( $taxonomies as $taxonomy ) {
        wp_cache_delete('all_ids', $taxonomy);
        wp_cache_delete('get', $taxonomy);
        delete_option("{$taxonomy}_children");
    }

    wp_cache_delete('get_terms', 'terms');

    do_action('clean_term_cache', $ids, $taxonomy);
}


/**
 * Retrieves the taxonomy relationship to the term object id.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @uses wp_cache_get() Retrieves taxonomy relationship from cache
 *
 * @param int|array $id Term object ID
 * @param string $taxonomy Taxonomy Name
 * @return bool|array Empty array if $terms found, but not $taxonomy. False if nothing is in cache for $taxonomy and $id.
 */
function &get_object_term_cache($id, $taxonomy) {
    $cache = wp_cache_get($id, "{$taxonomy}_relationships");
    return $cache;
}


/**
 * Updates the cache for Term ID(s).
 *
 * Will only update the cache for terms not already cached.
 *
 * The $object_ids expects that the ids be separated by commas, if it is a
 * string.
 *
 * It should be noted that update_object_term_cache() is very time extensive. It
 * is advised that the function is not called very often or at least not for a
 * lot of terms that exist in a lot of taxonomies. The amount of time increases
 * for each term and it also increases for each taxonomy the term belongs to.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 * @uses wp_get_object_terms() Used to get terms from the database to update
 *
 * @param string|array $object_ids Single or list of term object ID(s)
 * @param array|string $object_type The taxonomy object type
 * @return null|bool Null value is given with empty $object_ids. False if
 */
function update_object_term_cache($object_ids, $object_type) {
    if ( empty($object_ids) )
        return;

    if ( !is_array($object_ids) )
        $object_ids = explode(',', $object_ids);

    $object_ids = array_map('intval', $object_ids);

    $taxonomies = get_object_taxonomies($object_type);

    $ids = array();
    foreach ( (array) $object_ids as $id ) {
        foreach ( $taxonomies as $taxonomy ) {
            if ( false === wp_cache_get($id, "{$taxonomy}_relationships") ) {
                $ids[] = $id;
                break;
            }
        }
    }

    if ( empty( $ids ) )
        return false;

    $terms = wp_get_object_terms($ids, $taxonomies, 'fields=all_with_object_id');

    $object_terms = array();
    foreach ( (array) $terms as $term )
        $object_terms[$term->object_id][$term->taxonomy][$term->term_id] = $term;

    foreach ( $ids as $id ) {
        foreach ( $taxonomies  as $taxonomy ) {
            if ( ! isset($object_terms[$id][$taxonomy]) ) {
                if ( !isset($object_terms[$id]) )
                    $object_terms[$id] = array();
                $object_terms[$id][$taxonomy] = array();
            }
        }
    }

    foreach ( $object_terms as $id => $value ) {
        foreach ( $value as $taxonomy => $terms ) {
            wp_cache_set($id, $terms, "{$taxonomy}_relationships");
        }
    }
}


/**
 * Updates Terms to Taxonomy in cache.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @since 2.3
 *
 * @param array $terms List of Term objects to change
 * @param string $taxonomy Optional. Update Term to this taxonomy in cache
 */
function update_term_cache($terms, $taxonomy = '') {
    foreach ( $terms as $term ) {
        $term_taxonomy = $taxonomy;
        if ( empty($term_taxonomy) )
            $term_taxonomy = $term->taxonomy;

        wp_cache_add($term->term_id, $term, $term_taxonomy);
    }
}

//
// Private
//


/**
 * Retrieves children of taxonomy.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @access private
 * @since 2.3
 *
 * @uses update_option() Stores all of the children in "$taxonomy_children"
 *     option. That is the name of the taxonomy, immediately followed by '_children'.
 *
 * @param string $taxonomy Taxonomy Name
 * @return array Empty if $taxonomy isn't hierarachical or returns children.
 */
function _get_term_hierarchy($taxonomy) {
    if ( !is_taxonomy_hierarchical($taxonomy) )
        return array();
    $children = get_option("{$taxonomy}_children");
    if ( is_array($children) )
        return $children;

    $children = array();
    $terms = get_terms($taxonomy, 'get=all');
    foreach ( $terms as $term ) {
        if ( $term->parent > 0 )
            $children[$term->parent][] = $term->term_id;
    }
    update_option("{$taxonomy}_children", $children);

    return $children;
}


/**
 * Get array of child terms.
 *
 * If $terms is an array of objects, then objects will returned from the
 * function. If $terms is an array of IDs, then an array of ids of children will
 * be returned.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @access private
 * @since 2.3
 *
 * @param int $term_id Look for this Term ID in $terms
 * @param array $terms List of Term IDs
 * @param string $taxonomy Term Context
 * @return array Empty if $terms is empty else returns full list of child terms.
 */
function &_get_term_children($term_id, $terms, $taxonomy) {
    $empty_array = array();
    if ( empty($terms) )
        return $empty_array;

    $term_list = array();
    $has_children = _get_term_hierarchy($taxonomy);

    if  ( ( 0 != $term_id ) && ! isset($has_children[$term_id]) )
        return $empty_array;

    foreach ( $terms as $term ) {
        $use_id = false;
        if ( !is_object($term) ) {
            $term = get_term($term, $taxonomy);
            if ( is_wp_error( $term ) )
                return $term;
            $use_id = true;
        }

        if ( $term->term_id == $term_id )
            continue;

        if ( $term->parent == $term_id ) {
            if ( $use_id )
                $term_list[] = $term->term_id;
            else
                $term_list[] = $term;

            if ( !isset($has_children[$term->term_id]) )
                continue;

            if ( $children = _get_term_children($term->term_id, $terms, $taxonomy) )
                $term_list = array_merge($term_list, $children);
        }
    }

    return $term_list;
}


/**
 * Add count of children to parent count.
 *
 * Recalculates term counts by including items from child terms. Assumes all
 * relevant children are already in the $terms argument.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @access private
 * @since 2.3
 * @uses $wpdb
 *
 * @param array $terms List of Term IDs
 * @param string $taxonomy Term Context
 * @return null Will break from function if conditions are not met.
 */
function _pad_term_counts(&$terms, $taxonomy) {
    global $wpdb;

    // This function only works for post categories.
    if ( 'category' != $taxonomy )
        return;

    $term_hier = _get_term_hierarchy($taxonomy);

    if ( empty($term_hier) )
        return;

    $term_items = array();

    foreach ( $terms as $key => $term ) {
        $terms_by_id[$term->term_id] = & $terms[$key];
        $term_ids[$term->term_taxonomy_id] = $term->term_id;
    }

    // Get the object and term ids and stick them in a lookup table
    $results = $wpdb->get_results("SELECT object_id, term_taxonomy_id FROM $wpdb->term_relationships INNER JOIN $wpdb->posts ON object_id = ID WHERE term_taxonomy_id IN (".join(',', array_keys($term_ids)).") AND post_type = 'post' AND post_status = 'publish'");
    foreach ( $results as $row ) {
        $id = $term_ids[$row->term_taxonomy_id];
        ++$term_items[$id][$row->object_id];
    }

    // Touch every ancestor's lookup row for each post in each term
    foreach ( $term_ids as $term_id ) {
        $child = $term_id;
        while ( $parent = $terms_by_id[$child]->parent ) {
            if ( !empty($term_items[$term_id]) )
                foreach ( $term_items[$term_id] as $item_id => $touches )
                    ++$term_items[$parent][$item_id];
            $child = $parent;
        }
    }

    // Transfer the touched cells
    foreach ( (array) $term_items as $id => $items )
        if ( isset($terms_by_id[$id]) )
            $terms_by_id[$id]->count = count($items);
}

//
// Default callbacks
//

/**
 * Will update term count based on posts.
 *
 * Private function for the default callback for post_tag and category
 * taxonomies.
 *
 * @package WordPress
 * @subpackage Taxonomy
 * @access private
 * @since 2.3
 * @uses $wpdb
 *
 * @param array $terms List of Term IDs
 */
function _update_post_term_count( $terms ) {
    global $wpdb;

    foreach ( $terms as $term ) {
        $count = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->term_relationships, $wpdb->posts WHERE $wpdb->posts.ID = $wpdb->term_relationships.object_id AND post_status = 'publish' AND post_type = 'post' AND term_taxonomy_id = %d", $term ) );
        $wpdb->update( $wpdb->term_taxonomy, compact( 'count' ), array( 'term_taxonomy_id' => $term ) );
    }
}


/**
 * Generates a permalink for a taxonomy term archive.
 *
 * @since 2.6
 *
 * @param object|int|string $term
 * @param string $taxonomy
 * @return string HTML link to taxonomy term archive
 */
function get_term_link( $term, $taxonomy ) {
    global $wp_rewrite;

    // use legacy functions for core taxonomies until they are fully plugged in
    if ( $taxonomy == 'category' )
        return get_category_link($term);
    if ( $taxonomy == 'post_tag' )
        return get_tag_link($term);

    $termlink = $wp_rewrite->get_extra_permastruct($taxonomy);

    if ( !is_object($term) ) {
        if ( is_int($term) ) {
            $term = &get_term($term, $taxonomy);
        } else {
            $term = &get_term_by('slug', $term, $taxonomy);
        }
    }
    if ( is_wp_error( $term ) )
        return $term;

    $slug = $term->slug;

    if ( empty($termlink) ) {
        $file = get_option('home') . '/';
        $t = get_taxonomy($taxonomy);
        if ( $t->query_var )
            $termlink = "$file?$t->query_var=$slug";
        else
            $termlink = "$file?taxonomy=$taxonomy&term=$slug";
    } else {
        $termlink = str_replace("%$taxonomy%", $slug, $termlink);
        $termlink = get_option('home') . user_trailingslashit($termlink, 'category');
    }
    return apply_filters('term_link', $termlink, $term, $taxonomy);
}

/**
 * Display the taxonomies of a post with available options.
 *
 * This function can be used within the loop to display the taxonomies for a
 * post without specifying the Post ID. You can also use it outside the Loop to
 * display the taxonomies for a specific post.
 *
 * The available defaults are:
 * 'post' : default is 0. The post ID to get taxonomies of.
 * 'before' : default is empty string. Display before taxonomies list.
 * 'sep' : default is empty string. Separate every taxonomy with value in this.
 * 'after' : default is empty string. Display this after the taxonomies list.
 *
 * @since 2.6
 * @uses get_the_taxonomies()
 *
 * @param array $args Override the defaults.
 */
function the_taxonomies($args = array()) {
    $defaults = array(
        'post' => 0,
        'before' => '',
        'sep' => ' ',
        'after' => '',
    );

    $r = wp_parse_args( $args, $defaults );
    extract( $r, EXTR_SKIP );

    echo $before . join($sep, get_the_taxonomies($post)) . $after;
}

/**
 * Retrieve all taxonomies associated with a post.
 *
 * This function can be used within the loop. It will also return an array of
 * the taxonomies with links to the taxonomy and name.
 *
 * @since 2.6
 *
 * @param int $post Optional. Post ID or will use Global Post ID (in loop).
 * @return array
 */
function get_the_taxonomies($post = 0) {
    if ( is_int($post) )
        $post =& get_post($post);
    elseif ( !is_object($post) )
        $post =& $GLOBALS['post'];

    $taxonomies = array();

    if ( !$post )
        return $taxonomies;

    $template = apply_filters('taxonomy_template', '%s: %l.');

    foreach ( get_object_taxonomies($post) as $taxonomy ) {
        $t = (array) get_taxonomy($taxonomy);
        if ( empty($t['label']) )
            $t['label'] = $taxonomy;
        if ( empty($t['args']) )
            $t['args'] = array();
        if ( empty($t['template']) )
            $t['template'] = $template;

        $terms = get_object_term_cache($post->ID, $taxonomy);
        if ( empty($terms) )
            $terms = wp_get_object_terms($post->ID, $taxonomy, $t['args']);

        $links = array();

        foreach ( $terms as $term )
            $links[] = "<a href='" . attribute_escape(get_term_link($term, $taxonomy)) . "'>$term->name</a>";

        if ( $links )
            $taxonomies[$taxonomy] = wp_sprintf($t['template'], $t['label'], $links, $terms);
    }
    return $taxonomies;
}

/**
 * Retrieve all taxonomies of a post with just the names.
 *
 * @since 2.6
 * @uses get_object_taxonomies()
 *
 * @param int $post Optional. Post ID
 * @return array
 */
function get_post_taxonomies($post = 0) {
    $post =& get_post($post);

    return get_object_taxonomies($post);
}

?>