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Server: Apache/2.2.15 (CentOS)
System: Linux dot-k1-063.dothome.co.kr 2.6.32-754.35.1.el6.x86_64 #1 SMP Sat Nov 7 12:42:14 UTC 2020 x86_64
User: hackhan (1520)
PHP: 5.6.40
Disabled: passthru socket_create socket_accept
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File: /host/home1/hackhan/html/wp-admin/network/update.php
<?php
/**
 * Update/Install Plugin/Theme network administration panel.
 *
 * @package WordPress
 * @subpackage Multisite
 * @since 3.1.0
 */

if ( isset( $_GET['action'] ) && in_array( $_GET['action'], array( 'update-selected', 'activate-plugin', 'update-selected-themes' ), true ) ) {
	define( 'IFRAME_REQUEST', true );
}

/** Load WordPress Administration Bootstrap */
require_once __DIR__ . '/admin.php';

require ABSPATH . 'wp-admin/update.php';