PHP uses file stream to download file method

1. flush - refresh the output buffer
2. ob_clean - clear (erase) the output buffer
Note: The above two functions can solve the problem of garbled content of PHP download files

DEMO:

<?php
   //fname为要下载的文件名
   //$fpath为下载文件所在文件夹，默认是downlod
   function download($fname,$fpath="download/"){
       //避免中文文件名出现检测不到文件名的情况，进行转码utf-8->gbk
       $filename=iconv(&#39;utf-8&#39;, &#39;gb2312&#39;, $fname);        
       $path=$fpath.$filename;        
       if(!file_exists($path)){//检测文件是否存在
           echo "文件不存在！";            die();
       }        $fp=fopen($path,&#39;r&#39;);//只读方式打开
       $filesize=filesize($path);//文件大小
       //返回的文件(流形式)
       header("Content-type: application/octet-stream");        //按照字节大小返回
       header("Accept-Ranges: bytes");        //返回文件大小
       header("Accept-Length: $filesize");        //这里客户端的弹出对话框，对应的文件名
       header("Content-Disposition: attachment; filename=".$filename);        //================重点====================
       ob_clean();
       flush();        //=================重点===================
       //设置分流
       $buffer=1024;        //来个文件字节计数器
       $count=0;        
       while(!feof($fp)&&($filesize-$count>0)){            
       $data=fread($fp,$buffer);            
       $count+=$data;//计数
           echo $data;//传数据给浏览器端
       }
       fclose($fp);
   }
   download("testfile.doc");
   ?>