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>