php进行文件的强制下载
浏览器下载文件，例如在浏览器中可以直接打开的文件（.gif /.txt等)。在进行文件下载操作时,默认是通过浏览器直接打开,而不是下载保存文件。并且通过这种方法下载文件可以不暴漏下载文件所在的路径,可以在下载之前进行一系列的权限控制.如果强制浏览器下载，有二种方案，一是：把所有文件全部做成压缩文件等浏览器无法识别的格式，操作比较繁琐。二是：通过php操作header,进行强制下载。通过以下代码可以实现php强制文件下载，代码如下
1 <?php 2 3 if(isset($_GET['key'])) 4 { 5 $filename = './test.png'; 6 if(file_exists($filename)) 7 { 8 header ("Content-Type: application/force-download"); 9 header ('Content-Disposition: attachment;filename="'.$filename.'"');10 readfile ($filename);11 }12 }13 14 ?>15 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"16 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">17 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">18 <head>19 <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">20 <title>Document</title>21 </head>22 <body>23 <a href="./force_download.php?key=564984w1f321fd5s6f98rf7w1re">下载png</a>24 </body>25 </html>
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