PHP Regex for Paypal Payflow响应

$response = "RESULT=0&PNREF=ABC123&RESPMSG=Approved&AUTHCODE=123456";

preg_match('/RESULT=(\d+)&PNREF=([A-Z0-9]+)&RESPMSG=([^&]+)&AUTHCODE=(\d+)/', $response, $matches);

$resultCode = $matches[1];
$pnref = $matches[2];
$responseMsg = $matches[3];
$authCode = $matches[4];

echo "Result Code: " . $resultCode . "<br>";
echo "PNREF: " . $pnref . "<br>";
echo "Response Message: " . $responseMsg . "<br>";
echo "Authorization Code: " . $authCode . "<br>";

RESULT=0&PNREF=ABC123&RESPMSG=Approved&AUTHCODE=123456