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Server: Apache/2.4.54 (Debian)
System: Linux f988254d8f22 6.8.0-87-generic #88~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue Oct 14 14:03:14 UTC 2 x86_64
User: (1000)
PHP: 7.4.33
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File: /var/www/html/wp-admin/upgrade-functions.php
<?php
/**
 * WordPress Upgrade Functions. Old file, must not be used. Include
 * wp-admin/includes/upgrade.php instead.
 *
 * @deprecated 2.5.0
 * @package WordPress
 * @subpackage Administration
 */

_deprecated_file( basename( __FILE__ ), '2.5.0', 'wp-admin/includes/upgrade.php' );
require_once ABSPATH . 'wp-admin/includes/upgrade.php';