2 $referrer = '[no-referrer]';
3 if (isset($_SERVER['HTTP_REFERER'])) {
4 $referrer = $_SERVER['HTTP_REFERER'];
6 header('Access-Control-Allow-Origin: *');
7 header('Content-Type: application/json');
8 $arr = array('referrer' => $referrer);
9 echo json_encode($arr);