included_by() possible?

I wonder if it *could* be possible to dertmine which file included a file. If this is possible I´ll post a feature/request. It´s a bit annoying that I´ll have to set a variable each time, when I want the included file to know which is the include()ing file. eg. --- filea.php --- include('fileb.php'); --- fileb.php --- echo included_by(); // output 'fileb.php' or similar CURRENTLY, it´s only possible this way --- filea.php --- $origin=__FILE__; include('fileb.php'); --- fileb.php --- echo $origin; You´ll ask, why do you want to save this single line? Well, for end-user satisfaction. If a user wants to user one of my applications embedded in his own page, then it´d be best if the user just had to do <STUFF>aölsdkfaölsdkjf</STUFF> <OTHER>aösldkfjalskdjfa</OTHER> <?php include('my.application.php'); ?> just like a nice component you plug into a page, no variables no constants, no function calls, just a single include instruction.