public static function optimizeImages()
 {
     if (!empty($_POST['post_id']) && !empty($_POST['img_post_id'])) {
         $post_id = intval($_POST['post_id']);
         $img_post_id = intval($_POST['img_post_id']);
         if (!empty($_POST['img_exclude'])) {
             $img_exclude = $_POST['img_exclude'];
         } else {
             $img_exclude = array();
         }
         $ret = ImageHelper::_optimizeImages($post_id, $img_post_id, $img_exclude);
     } else {
         $ret = array('success' => false, 'msg' => __('The post is not existed, please choose one another!', 'wp-meta-seo'));
     }
     echo json_encode($ret);
     wp_die();
 }