No need for debug_backtrace()
. To get the referring page, you could replace this:
$filename = debug_backtrace();
$page = $filename[0]['file'];
With this:
$page = $_SERVER['HTTP_REFERER'];
However, $_SERVER['HTTP_REFERER']
is unreliable according to the PHP docs:
This is set by the user agent. Not all user agents will set this, and some provide the ability to modify HTTP_REFERER as a feature. In short, it cannot really be trusted.
So another solution is to add an additional field in the referring form and retrieve it in the PHP script e.g.
<input name="referrer" type="hidden" value="<?php echo $_SERVER['PHP_SELF'];?>"/>
Then:
$page = $_REQUEST['referrer'];