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 typeheader('Content-type: image/jpeg');// Get new dimensionslist($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);// Outputimagejpeg($image_p, null, 100);// Imagedestroyimagedestroy ($image_p);?>