Thumbnail Tutorial

<?PHP
function imgepreview ($Pfad,$ID,$groeße)
{
$groesse=getimagesize($Pfad);
$breite=$groesse[0];
$hoehe=$groesse[1];
$typ=$groesse[2];
$hoehe2=$hoehe*$groeße/$breite;
$image1 = imagecreatetruecolor($groeße,$hoehe2);
switch ($typ)
{
case 1:
$image = imagecreatefromgif($Pfad); $type="gif";
break;
case 2:
$image = imagecreatefromjpeg($Pfad); $type="jpg";
break;
}
imagecopyresized($image1, $image, 0,0, 0,0,$groeße,$hoehe2,$breite,$hoehe);


switch ($typ)
{
case 1:
imagegif($image1,getcwd()."/screens/tmp/$ID.gif");
break;
case 2:
imagejpeg($image1,getcwd()."/screens/tmp/$ID.jpg",85);
break;
imagedestroy($image1);
imagedestroy($image);
}


return $type;
}


if ($match->screen6) { $type=imgepreview("$uploaddir/$match->screen6", 6 ,300); echo '[url='',$match->screen6,''][img]screens/tmp/6.',$type,'[/img][/url]',"\n"; } ?> 
<input name="screen6" type="file" class="form" >