<?php
$w=$_GET['w'];$h=$_GET['h'];$s=$_GET['img'];
list($width, $height, $type, $attr) = getimagesize($s);
if(empty($w))$w=$width*$h/$height;
if (empty($h))$h=$heignt*$w/$width;
$q=$width/$height;
if ($q>1) $h=$w/$q;
else $w=$h*$q;
header('Content-type: image/jpeg');
$thumb = imagecreatetruecolor($w, $h);
$source = imagecreatefromjpeg($s);
imagecopyresized($thumb, $source, 0, 0, 0, 0, $w, $h, $width, $height);
imagejpeg($thumb);
?>