note 58048 added to function.is-file

Plesase! Help me somebody! How can I ask the PHP to read a file's extension? For example: I have a file (index.php) and i want PHP to 'say', it has a 'php' extension. Help me please! ---- Manual Page -- http://www.php.net/manual/en/function.is-file.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+58048 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+58048&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+58048&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+58048&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+58048&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+58048&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+58048&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+58048&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+58048&report=yes Search -- http://master.php.net/manage/user-notes.php