Re: separating a file extention

I'm a bit confused as to what you mean by posting the list into a text field (do you want to print_r the list?). But an easy, efficient (I think) way to do this is strrpos(). <?php function sort_extensions($a, $b) { $apos = ($pos = strrpos($a, '.')) ? (strlen($a) - $pos) : 0; $bpos = ($pos = strrpos($b, '.')) ? (strlen($b) - $pos) : 0; if ($apos == $bpos) {

    return 0;

} return $apos < $bpos ? -1 : 1; } $files = array('test.zip',

               'test.gz',
               'test.z',
               'test.jpeg',
               'test.jpg',
               'test');

usort($files, 'sort_extensions'); echo '<pre>'; print_r($files); echo '</pre>'; ?>