Retrieve file name

Is there a PHP function which can retrieve the name of the file where the function resides?
Thanks!

I'm not sure I understand what you want, but possibly it's the FILE "magic constant"?

My question is that, all the php files include a file named "my_include.inc", in the "my_include.inc", there are code looks like below snippet,

$file_name=??? // how to get it?
if($file_name=="index.php")
echo "this is the index page";
else
echo "some other page located";

So how to get the file name which include the "my_include.inc" from within the file of "my_include.inc"? Thanks!

$_SERVER['SCRIPT_FILENAME']

Or if you just want the file name without the directory path: basename($_SERVER['SCRIPT_FILENAME'])

I will look at it carefully, Thank you very much!