php动态生成缩略图并输出显示的方法

<img src="thumbs.php?filename=photo.jpg&width=100&height=100">

<?php
$filename= $_get['filename'];
$width = $_get['width'];
$height = $_get['height'];
$path="http://localhost/images/"; //finish in "/"
// content type
header('content-type: image/jpeg');
// get new dimensions
list($width_orig, $height_orig) = getimagesize($path.$filename);
if ($width && ($width_orig < $height_orig)) {
  $width = ($height / $height_orig) * $width_orig;
} else {
  $height = ($width / $width_orig) * $height_orig;
}
// resample
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($path.$filename);
imagecopyresampled($image_p,$image,0,0,0,0,$width,$height,$width_orig,$height_orig);
// output
imagejpeg($image_p, null, 100);
// imagedestroy
imagedestroy ($image_p);
?>