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Server: Apache/2.4.62 (Debian)
System: Linux wordpress-7cb4c6b6f6-5fkwz 5.15.0-101-generic #111-Ubuntu SMP Tue Mar 5 20:16:58 UTC 2024 x86_64
User: www-data (33)
PHP: 8.3.20
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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';