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Server: Apache/2.4.54 (Debian)
System: Linux a5825d2beacc 4.15.0-197-generic #208-Ubuntu SMP Tue Nov 1 17:23:37 UTC 2022 x86_64
User: root (0)
PHP: 8.1.14
Disabled: NONE
$ pwd: /var/www/html/wp-admin/
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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';
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