PHP -Dateierweiterung vom Dateinamen erhalten
$ext = pathinfo($filename, PATHINFO_EXTENSION);
Geeky Bravo
$ext = pathinfo($filename, PATHINFO_EXTENSION);// your file
$file = 'image.jpg';
$info = pathinfo($file);
// Before PHP 5.2
$file_name = basename($file, '.'.$info['extension']);
// After PHP 5.2
$file_name = $info['filename'];