public function __construct() { parent::__construct(); $this->title = __('Query Strings', 'ninja-forms'); $this->merge_tags = array('' => array('tag' => '{query_string_key}', 'label' => __('Query String', 'ninja_forms'))); if (is_admin()) { return; } if (!is_array($_GET)) { return; } foreach ($_GET as $key => $value) { $value = WPN_Helper::get_query_string($key); $this->set_merge_tags($key, $value); } }