Bulk update post slugs in a WordPress blog

The following PHP script updates missing post slugs (permalinks) in a WordPress blogs, or reformats them according to your needs:

";
<?php
// change this this to strip old slugs if needed:
//update wp_posts set post_name = '' where guid like '%.asp'
set_time_limit(20000);
 
/** Loads the WordPress Environment and Template, allowing wp functions like the_title() */
define('WP_USE_THEMES', false);
require('./wp-blog-header.php');
 
function bleach($which)
{
    $result = sanitize_title(get_the_title($which));
    return $result;
}
 
$dbhost = 'localhost';
$dbuser = 'test';
$dbpass = 'test';
$dbname = 'WordPress';
 
$sql = 'SELECT ID, post_title' . ' FROM `wp_posts`' . ' WHERE post_status = "publish"' . " and post_name = '' " . ' order by ID asc';
 
$db = mysql_connect($dbhost, $dbuser, $dbpass) or die('Could not connect: ' . mysql_error());
mysql_select_db($dbname);
 
$result = mysql_query($sql) or die(&#039;<strong>Query failed: ' . mysql_error());
while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
    $id         = $row['ID'];
    $title      = $row['post_title'];
    $clean_slug = bleach($id);
 
    echo "ID<em>:{$row['ID']} " . "post_title : {$title} " . "sanitized : {$clean_slug} ";
    $sql_u = "UPDATE `wp_posts` SET post_name = '" . $clean_slug . "' " . 'WHERE ID = ' . $id;
    echo '<strong>QUERY:</strong>' . $sql_u . '';
    mysql_query($sql_u) or die('ERROR: ' . mysql_error());
    flush();
}
 
mysql_close($db);
?&gt;
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