'wpcf7_contact_form', 'classname' => __CLASS__, 'inject_function' => 'injectLeadEvent')); } public static function injectLeadEvent() { if (FacebookPluginUtils::isAdmin()) { return; } $param = array(); $code = FacebookPixel::getPixelLeadCode($param, self::TRACKING_NAME, false); $listener = 'wpcf7submit'; printf(" ", $listener, $code); } }