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Server: Apache
System: Linux sg241.singhost.net 2.6.32-896.16.1.lve1.4.51.el6.x86_64 #1 SMP Wed Jan 17 13:19:23 EST 2018 x86_64
User: honghock (909)
PHP: 8.0.30
Disabled: passthru,system,shell_exec,show_source,exec,popen,proc_open
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File: /home/honghock/public_html/wp-admin/ms-upgrade-network.php
<?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;