Combine Js

<?php
/*
 * combine js
 */
define('WP_USE_THEMES', false);
if (file_exists($_SERVER['DOCUMENT_ROOT'] . DIRECTORY_SEPARATOR . 'wp-blog-header.php')) {
    require($_SERVER['DOCUMENT_ROOT'] . DIRECTORY_SEPARATOR . 'wp-blog-header.php');
} else {
    while (! file_exists('wp-blog-header.php') )
    chdir('..');
    require ("wp-blog-header.php");
}
// Exit if accessed directly without wp-blog-header.php
if ( !defined( 'ABSPATH' ) ) exit;

status_header(200);
header('Content-type: text/javascript');
header('Expires: '.gmdate('D, d M Y H:i:s \G\M\T', time() + 3600 * 24));

do_action("firmasite_combine_js");