PHP programming forum. Ask questions or help people concerning PHP code. Don't understand a function? Need help implementing a class? Don't understand a class? Here is where to ask. Remember to do your homework!
Something else to consider, if you leave the form action value blank, the form should post back to itself, so the action value is not necessary. There are also other way to get the page name rather than $_SERVER['PHP_SELF'], but a lot of that was already covered in this, and many other, thread(s).