header('Access-Control-Allow-Origin: *') (ok)

Access to XMLHttpRequest at 'https://yp.vn/postjson.php/?data=array&q=van' from origin 'http://localhost' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Origin: https://www.example.com');