<?php /** * Multisite upgrade administration panel. * * @package WordPress * @subpackage Multisite * @since 3.0.0 */ require_once __DIR__ . '/admin.php'; wp_redirect( network_admin_url( 'upgrade.php' ) ); exit;

Source <?php
/**
 * Multisite upgrade administration panel.
 *
 * @package WordPress
 * @subpackage Multisite
 * @since 3.0.0
 */

require_once __DIR__ . '/admin.php';

wp_redirect( network_admin_url( 'upgrade.php' ) );
exit;
<?php /** * Multisite upgrade administration panel. * * @package WordPress * @subpackage Multisite * @since 3.0.0 */ require_once __DIR__ . '/admin.php'; wp_redirect( network_admin_url( 'upgrade.php' ) ); exit;