i've had success for getting a file extension by using strrchr($filename,'.'), this gets me the extension along with the '.'. if you don't want the dot, you can trim it off as well.
----
Server IP: 208.69.120.35
Probable Submitter: 207.71.246.177
----
Manual Page -- http://www.php.net/manual/en/function.mime-content-type.php
Edit -- https://master.php.net/note/edit/86065
Del: integrated -- https://master.php.net/note/delete/86065/integrated
Del: useless -- https://master.php.net/note/delete/86065/useless
Del: bad code -- https://master.php.net/note/delete/86065/bad+code
Del: spam -- https://master.php.net/note/delete/86065/spam
Del: non-english -- https://master.php.net/note/delete/86065/non-english
Del: in docs -- https://master.php.net/note/delete/86065/in+docs
Del: other reasons-- https://master.php.net/note/delete/86065
Reject -- https://master.php.net/note/reject/86065
Search -- https://master.php.net/manage/user-notes.php
lmpx.com only provides a reader for public news (NNTP) servers. It is not
affiliated with the servers or forums shown here and is not responsible for
the content of articles, which is written by their respective authors.