php实现图片下载

download.php下载代码

 <?php
 //获取要下载的文件名
 $filename = $_GET['filename'];
 //设置头信息
 header('Content-Disposition:attachment;filename=' . basename($filename));
 header('Content-Length:' . filesize($filename));
 //读取文件并写入到输出缓冲
 readfile($filename);

Html调用

<a href="download.php?filename=./files/test1.jpg">下载图片</a>