<?php class Downfile {     function downserver($file_name){ $file_path = "./img/".$file_name; //转码，文件名转为gb2312解决中文乱码 $file_name = iconv("utf-8","gb2312",$file_name); $file_path = iconv("utf-8","gb2312",$file_path); $fp = fopen($file_path,"r") or exit("文件不存在"); //定义变量空着每次下载的大小 $buffer = 1024; //得到文件的大小 $file_size = filesize($file_path); //header("Content-type:text/html;charset=gb2312"); //会写用到的四条http协议信息 header("Content-type:application/octet-stream"); header("Accept-Ranges:bytes");//可以忽略 header("Content-Length: ".$file_size);//原文这里是Accept-Length经查阅http协议无此项 header("Content-Disposition:attachment;filename=".$file_name); //字节技术器，纪录当前现在字节数 $count = 0; while(!feof($fp) && $file_size-$count>0){ //从$fp打开的文件流中每次读取$buffer大小的数据 $file_data = fread($fp,$buffer); $count+=$buffer; //将读取到的数据读取出来 echo $file_data; } //关闭文件流 fclose($fp);     }    } ?>