The following is the PHP code to send a toast notification to the URL "_URL_TO_SEND_TO_" which is the token received from the MPNS:
<?php
// Create the toast message
$toastMessage = "<?xml version=\"1.0\" encoding=\"utf-8\"?>" .
"<wp:Notification xmlns:wp=\"WPNotification\">" .
"<wp:Toast>" .
"<wp:Text1>" . "SendToast" . "</wp:Text1>" .
"<wp:Text2>" . "Text Message" . "</wp:Text2>" .
"</wp:Toast> " .
"</wp:Notification>";
// Create request to send
$r = curl_init();
curl_setopt($r, CURLOPT_URL,_URL_TO_SEND_TO_);
curl_setopt($r, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($r, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HEADER, true);
// add headers
$httpHeaders=array('Content-type: text/xml; charset=utf-8', 'X-WindowsPhone-Target: toast',
'Accept: application/*', 'X-NotificationClass: 2','Content-Length:'.strlen($toastMessage));
curl_setopt($r, CURLOPT_HTTPHEADER, $httpHeaders);
// add message
curl_setopt($r, CURLOPT_POSTFIELDS, $toastMessage);
// execute request
$output = curl_exec($r);
curl_close($r);
?>
If this is the code you need, please check this answer.