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PHP:
скопировать код в буфер обмена
<?PHP 
 
function createthumbnail($filetype, $origfile, $thumbfile, $new_w, $new_h, $par) {
    
    if ($filetype == 1) { $origimage = imagecreatefromgif($origfile); }
    elseif ($filetype == 2) { $origimage = imagecreatefromjpeg($origfile); }
    elseif ($filetype == 3) { $origimage = imagecreatefrompng($origfile); }
    
    $old_x = imagesx($origimage);
    $old_y = imagesy($origimage);
    
    if ($old_x > $new_w || $old_y > $new_h) {
        if (($old_x < $old_y) && $par=='n') {
            $thumb_w = round(($old_x * $new_h) / $old_y);
            $thumb_h = $new_h;
        } elseif (($old_x > $old_y) && $par=='n') {
            $thumb_w = $new_w;
            $thumb_h = round(($old_y * $new_w) / $old_x);
        } elseif (($old_x < $old_y) && $par=='s') {
            $thumb_w = $new_w;
            $thumb_h = round(($old_y * $new_w) / $old_x);
        } elseif (($old_x > $old_y) && $par=='s') {
            $thumb_w = $new_w;
            $thumb_h = round(($old_y * $new_w) / $old_x);
        } else {
            $thumb_w = $new_w;
            $thumb_h = $new_h;
        }
    } else {
        $thumb_w = $old_x;
        $thumb_h = $old_y;
    }
    
    $thumbimage = imagecreatetruecolor($thumb_w,$thumb_h);
    $result = imagecopyresampled($thumbimage, $origimage, 0, 0, 0, 0, $thumb_w, $thumb_h, $old_x, $old_y);
    
    touch($thumbfile);
 
    if ($filetype == 1) { imagegif($thumbimage, $thumbfile); }
    elseif ($filetype == 2) { imagejpeg($thumbimage, $thumbfile); }
    elseif ($filetype == 3) { imagepng($thumbimage, $thumbfile); }
}
 
if (isset($_GET['url']) && $_GET['url']!='' && isset($_GET['w']) && $_GET['w']!='' && isset($_GET['p']) && ($_GET['p']=='n' || $_GET['p']=='s')) {
    $url = $_GET['url'];
    $width = $_GET['w'];
    $height = (isset($_GET['h']) ? $_GET['h'] : '500');
    $par = $_GET['p'];
    
    $pic_types = array(".gif",".jpg",".jpeg",".png");
    $pic = basename($url);
    $pic_name = explode(".", $pic);
     $pic_ext = strtolower(strrchr($pic,"."));
    if (!in_array($pic_ext, $pic_types)) {
        exit();
    } else {
        $imagefile = getimagesize($url);
        $thumb = "cache/".$pic_name[0]."_".$width.$par.$pic_ext;
        if (!file_exists($thumb) || filesize($thumb)==0) { createthumbnail($imagefile[2], $url, $thumb, $width, $height, $par); }
    }
    header('Location: '.$thumb);
}
 
?>