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<?php 

// To be added to top of php file which serves the AJAX Request
// Checks for HTTP_ORIGIN against multiple domains

$http_origin = $_SERVER['HTTP_ORIGIN'];
if ($http_origin == "http://www.domain1.com" || $http_origin == "http://www.domain2.com" || $http_origin == "http://www.domain3.info")
{ 
   header('Access-Control-Allow-Origin: *');
}

header('Access-Control-Allow-Methods: POST, GET, OPTIONS');
header('Access-Control-Max-Age: 1000');

if(array_key_exists('HTTP_ACCESS_CONTROL_REQUEST_HEADERS', $_SERVER)) {
    header('Access-Control-Allow-Headers: '
           . $_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']);
} else {
    header('Access-Control-Allow-Headers: *');
}

if("OPTIONS" == $_SERVER['REQUEST_METHOD']) {
    exit(0);
}

?>