<?
function thumb($filename,$x,$y= 0 )
{
$t=getimagesize($filename) or die('Unknown type of image');
$with=$t[ 0 ];
$height=$t[ 1 ];
switch ($t[ 2 ])
{
case  1 :
$type='GIF';
$img=imagecreatefromgif($filename);
break;
case  2 :
$type='JPEG';
$img=imagecreatefromjpeg($filename);
break;
case  3 :
$type='PNG';
$img=imagecreatefrompng($filename);
break;
}
if($y== 0 )
{$y=$x*($height/$with);}

header("Content-type: image/jpeg");
$thumb=imagecreate($x,$y);
ImageCopyResampled($thumb, $img,  0 ,  0 ,  0 ,  0 ,$x,$y,$with,$height);
$thumb=imagejpeg($thumb);
return $thumb;
}
$file=$_GET['file'];
if($file)
{
echo thumb($file, 200 );
}
?>