How to read a directory and get the file extension

[searain]

<?php

$dir = opendir($mydir);
while((false!==($file=readdir($dir))))
if($file!="." and $file !="..")
echo($mydir.'/'.$file);
closedir($dir);

?>

Is there a funciton I can get the file extension within that directory "mydir"? Or I just have to write my own funciton to do so?

Thanks!

[Drakla]

[man]pathinfo[/man]