PHP用流方式制作缩略图

<?php

include_once ('inc/db_mysql.inc.php');

include_once ('inc/config.php');

include_once ('class/function.php');
global $picPath;
if (strstr($_SERVER[HTTP_USER_AGENT],"MSIE")) {

$attachment = '';

} else {

$attachment = ' atachment;';

}
$image = getInfo('newssp_gallery','id',$_GET['id']);
$filename = $picPath.$image['filename'];
if (!file_exists($filename)) {

$filename = $picPath."notexist.gif";

}
header("Cache-Control: no-store, no-cache, must-revalidate"); // HTTP/1.1

header("Cache-Control: post-check=0, pre-check=0", false);

header("Pragma: no-cache");// HTTP/1.0
header("Content-disposition:".$attachment." filename=".$image['original']);
$size = @filesize($filename);
header("Content-Length: $size");
$fd = @fopen($filename,rb);

$contents = @fread($fd,$size);

@fclose ($fd);
echo $contents;

?>