MacAddict 104/MacAddict_104_2005-04.iso/Software/Internet & Communication/WordPress 1.2.2 freeware.dmg/wordpress/wp-includes/links-update-xml.php

PHP Script | 2004-05-05 | 4.9 KB | 174 lines

<?php
// Links weblogs.com grabber
// Copyright (C) 2003 Mike Little -- [e-mail]

// Get the path of our parent directory:
$parentpath = dirname(dirname(__FILE__));

require_once($parentpath.'/wp-config.php');

// globals to hold state
$updated_timestamp = 0;
$all_links = array();

/**
 ** preload_links()
 ** Pre-load the visible, non-blank, links into an associative array $all_links
 ** key is url, value is array of link_id and update_time
 ** Note: update time is initialised to 0. That way we only have to update (in
 ** the db) the ones which have been updated (on weblogs.com).
 **/
function preload_links() {
    global $tablelinks, $all_links, $wpdb;
    $links = $wpdb->get_results("SELECT link_id, link_url FROM $tablelinks WHERE link_visible = 'Y' AND link_url <> ''");
    foreach ($links as $link) {
        $link_url = transform_url($link->link_url);
        $all_links[$link_url] = array($link->link_id, 0);
    }
}

/**
 ** update_links()
 ** Update in the db the links which have been updated ($all_links[url][1] != 0)
 **/
function update_links() {
    global $tablelinks, $all_links, $wpdb;
    reset($all_links);
    while (list($id, $val) = each($all_links)) {
        if ($val[1]) {
            $wpdb->query("UPDATE $tablelinks SET link_updated = '$val[1]' WHERE link_id = $val[0]");
        }
    } // end while
}

/**
 ** get_weblogs_updatedfile()
 ** Retrieves and caches a copy of the weblogs.com changed blogs xml file.
 ** If the file exists check it's age, get new copy if old.
 ** If a new or updated file has been written return true (needs processing)
 ** otherwise return false (nothing to do)
 **/
function get_weblogs_updatedfile() {
    global $ignore_weblogs_cache;
    $update = false;
    $file = ABSPATH . 'wp-content/links-update-cache.xml';
    if ($ignore_weblogs_cache) {
        $update = true;
    } else {
        if (file_exists($file)) {
            // is it old?
            $modtime = filemtime($file);
            if ((time() - $modtime) > (get_settings('weblogs_cacheminutes') * 60)) {
                $update = true;
            }
        } else { // doesn't exist
            $update = true;
        }
    }

    if ($update) {
        // get a new copy
        $a = @file(get_settings('weblogs_xml_url'));
        if ($a != false && count($a) && $a[0]) {
            $contents = implode('', $a);

            // Clean up the input, because weblogs.com doesn't output clean XML
            $contents = preg_replace("/'/",''',$contents);
            $contents = preg_replace('|[^[:space:][:punct:][:alpha:][:digit:]]|','',$contents);

            $cachefp = fopen(ABSPATH . 'wp-content/links-update-cache.xml', "w");
            fwrite($cachefp, $contents);
            fclose($cachefp);
        } else {
            return false; //don't try to process
        }
    }
    return $update;
}

/**
 ** startElement()
 ** Callback function. Called at the start of a new xml tag.
 **/
function startElement($parser, $tagName, $attrs) {
    global $updated_timestamp, $all_links;
    if ($tagName == 'WEBLOGUPDATES') {
        //convert 'updated' into php date variable
        $updated_timestamp = strtotime($attrs['UPDATED']);
        //echo('got timestamp of ' . gmdate('F j, Y, H:i:s', $updated_timestamp) . "\n");
    } else if ($tagName == 'WEBLOG') {
        // is this url in our links?
        $link_url = transform_url($attrs['URL']);
        if (isset($all_links[$link_url])) {
            $all_links[$link_url][1] = date('YmdHis', $updated_timestamp - $attrs['WHEN']);
            //echo('set link id ' . $all_links[$link_url][0] . ' to date ' . $all_links[$link_url][1] . "\n");
        }
    }
}

/**
 ** endElement()
 ** Callback function. Called at the end of an xml tag.
 **/
function endElement($parser, $tagName) {
    // nothing to do.
}

/**
 ** transform_url()
 ** Transforms a url to a minimal identifier.
 **
 ** Remove www, remove index.* or default.*, remove
 ** trailing slash
 **/
function transform_url($url) {
    //echo("transform_url(): $url ");
    $url = str_replace('www.', '', $url);
    $url = str_replace('WWW.', '', $url);
    $url = preg_replace('/(?:index|default)\.[a-z]{2,}/i', '', $url);
    if (substr($url, -1, 1) == '/') {
        $url = substr($url, 0, -1);
    }
    //echo(" now equals $url\n");
    return $url;
} // end transform_url

// get/update the cache file.
// true return means new copy
if (get_weblogs_updatedfile()) {
    //echo('<pre>');
    // pre-load the links
    preload_links();

    // Create an XML parser
    $xml_parser = xml_parser_create();

    // Set the functions to handle opening and closing tags
    xml_set_element_handler($xml_parser, "startElement", "endElement");

    // Open the XML file for reading
    $fp = fopen(ABSPATH . 'wp-content/links-update-cache.xml', "r")
          or die("Error reading XML data.");

    // Read the XML file 16KB at a time
    while ($data = fread($fp, 16384)) {
        // Parse each 4KB chunk with the XML parser created above
        xml_parse($xml_parser, $data, feof($fp))
                or die(sprintf("XML error: %s at line %d",
                    xml_error_string(xml_get_error_code($xml_parser)),
                    xml_get_current_line_number($xml_parser)));
    }

    // Close the XML file
    fclose($fp);

    // Free up memory used by the XML parser
    xml_parser_free($xml_parser);

    // now update the db with latest times
    update_links();

    //echo('</pre>');
} // end if updated cache file

?>