PHP Headers for CORS Request

When any request is sent to a php file from other domain then in file these header should be added to accept the request. 

When API call is sent to a file in any php file

// required headers
header("Access-Control-Allow-Origin: *");
header("Content-Type: application/json; charset=UTF-8");
header("Access-Control-Allow-Methods: POST");
header("Access-Control-Max-Age: 3600");
header("Access-Control-Allow-Headers: Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With");
 

$data = json_decode(file_get_contents("php://input"));

print_r($data);