Zitat:
if($file != ""){
$str_file_ext = substr( strtolower( strrchr($_FILES['file']['name'], '.') ), 1 );

$idxarr_allowed_ext = array('jpg', 'jpeg', 'gif', 'png');
if (!in_array($str_file_ext, $idxarr_allowed_ext) ) {
echo "<h3><font color=#FF0000>Unzulaessige Dateiendung!</font></h3>";
$fehler = TRUE; }
}