为啥这段代码不能实现文件下载?

Question

为什么我这段代码不能实现文件下载，在LINUX和WINDOWS下我都试过了。在WINDOWS下运行到OB_start();程序就没运行下去了。

<?php
$root="D:/wamp/www/panjinli/downloadsouce";
if(is_dir($root))
{
   $openHandle=opendir($root);
   while(false!==($file=readdir($openHandle)))
   {
       if(!is_dir($root.$file))
   {
         echo "<a href="http://www.php1.cn/">        }
   }
   closedir($openHandle);
}else
{
echo "文件夹不存在";
}
 
$do=(isset($_REQUEST['do'])) ? addslashes($_REQUEST['do']) : '';
if($do=='down')
{
    $file=(isset($_REQUEST['file'])) ? addslashes($_REQUEST['file']) : '';
    $path=(isset($_REQUEST['path'])) ? addslashes($_REQUEST['path']) : '';
    OB_start();
    function DownLoad($info,$file) 
{
        OB_Clean();
        if(!file_exists($info))
{
            exit('Error:'.__LINE__.','.basename(__FILE__).'!');
        }
        $info=file_get_contents($info);
 
        header('Content-Transfer-Encoding: binary');
        header('Content-Type: application/force-download; name="'.$file.'"');
        header('Content-Disposition: attachment; filename='.$file.'');
        header('Cache-control: private');
        header('Pragma: no-cache');
        header('Expires: 0');
        echo $info;
        die();
    }
    DownLoad($path.$file,$file);
}
?>

Answer 1

Why can’t this code be used to download files? - PHP Chinese website Q&A - Why can’t this code be used to download files? - PHP Chinese website Q&A

Take a look around and learn.

Answer 2

将DownLoad($path.$file,$file);换成DownLoad($path.'/'.$file,$file);