<?php $file_name="哈哈.jpg";//需要下载的文件 $file_name=iconv("utf-8","gb2312","$file_name"); $fp=fopen($file_name,"r+");//下载文件必须先要将文件打开，写入内存 if(!file_exists($file_name)){//判断文件是否存在     echo "文件不存在";     exit(); } $file_size=filesize("a.jpg");//判断文件大小 //返回的文件 Header("Content-type: application/octet-stream"); //按照字节格式返回 Header("Accept-Ranges: bytes"); //返回文件大小 Header("Accept-Length: ".$file_size); //弹出客户端对话框，对应的文件名 Header("Content-Disposition: attachment; filename=".$file_name); //防止服务器瞬时压力增大，分段读取 $buffer=1024; while(!feof($fp)){     $file_data=fread($fp,$buffer);     echo $file_data; } //关闭文件 fclose($fp); ?>

     function download_by_path($path_name, $save_name){          ob_end_clean();          $hfile = fopen($path_name, "rb") or die("Can not find file: $path_name\n");          Header("Content-type: application/octet-stream");          Header("Content-Transfer-Encoding: binary");          Header("Accept-Ranges: bytes");          Header("Content-Length: ".filesize($path_name));          Header("Content-Disposition: attachment; filename=\"$save_name\"");          while (!feof($hfile)) {             echo fread($hfile, 32768);          }          fclose($hfile);     }