使用jQuery或Javascript包含PHP文件

Javascript代码：

$('#myform').on('submit',function(e){
    e.preventDefault();
    $.get($(this).attr('action') + $(this).serialize());
    alert("Thank You! \nTop Up for: <?PHP echo "$username" ?> Purchased Successfully");
    $.get("mail.PHP");  //this is the added part to get mail.PHP//
    location.reload();

PHP – mail.PHP：

<?PHP

$to = "stephan@mail.co.za";

$headers = "From: website mail \r\n";

$email_body = "has just toped up his account.\n".

$email_subject = "User Topup Alert";

mail($to,$email_subject,$email_body,$headers);

?>