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php 实现文件下载

WBOY
WBOYOriginal
2016-06-08 17:33:141014browse
<script>ec(2);</script>

//author:heaven
//文件下载
function download($file_dir,$file_name)
//参数说明:
//file_dir:文件所在目录
//file_name:文件名
{
     $file_dir = chop($file_dir);//去掉路径中多余的空格
     //得出要下载的文件的路径
     if($file_dir != '')
     {
         $file_path = $file_dir;
         if(substr($file_dir,strlen($file_dir)-1,strlen($file_dir)) != '/')
             $file_path .= '/';
         $file_path .= $file_name;
     }           
     else
         $file_path = $file_name;   

   
     //判断要下载的文件是否存在
     if(!file_exists($file_path))
     {
         echo '对不起,你要下载的文件不存在。';
         return false;
     }

     $file_size = filesize($file_path);

     header("Content-type: application/octet-stream");
     header("Accept-Ranges: bytes");
     header("Accept-Length: $file_size");
     header("Content-Disposition: attachment; filename=".$file_name);
 
  //echo file_get_contents($file_path);
   
     $fp = fopen($file_path,"r");
     $buffer_size = 1024;
     $cur_pos = 0;
   
     while(!feof($fp)&&$file_size-$cur_pos>$buffer_size)
     {
         $buffer = fread($fp,$buffer_size);
         echo $buffer;
         $cur_pos += $buffer_size;
     }
   
     $buffer =@fread($fp,$file_size-$cur_pos);
     echo $buffer;
  
     fclose($fp);
     return true;
 

}

 

 

页面处理部分

$dir = "../main/trade_log";  
// Open a known directory, and proceed to read its contents  
if (is_dir($dir))
 {  
     $filename=array();
    if ($dh = opendir($dir))
    {  
     while (($file = readdir($dh)) !== false)
   {  
      if ($file!="." && $file!=".." && $file!=".svn")
    {

           $filename[]=$file;
    }  
    }  
     closedir($dh);  
    }  
}  

if(isset($_GET['logname']))
{

   download("../main/trade_log",$_GET['logname']);
   exit;

}
$smarty->assign("trade_log_list",$filename);

 

注意这块

   download("../main/trade_log",$_GET['logname']);
   exit;

一定要加exit

否则下载的文件display的部分也要输出

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