php实现简单文件下载的方法_PHP

WBOY
Release: 2016-05-31 13:17:41
Original
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本文实例讲述了php实现简单文件下载的方法。分享给大家供大家参考。具体如下:

这里介绍的php文件下载代码,只是简单实现了一张图片的下载功能,还不完善,最好是封装到一个类里,或是采用函数调用。感兴趣的朋友可以在此基础上加以完善!

php文件下载代码如下:

<&#63;php
$file_name = "2.jpg";//需要下载的图片
define("SPATH","/php/image/");//存放图片的相对路径
$file_sub_path = $_SERVER['DOCUMENT_ROOT'];//网站根目录的绝对地址
$file_path = $file_sub_path.SPATH.$file_name;//图片绝对地址,即前面三个连接
//判断文件是否存在
if(!file_exists($file_path)){
 echo "该文件不存在";
 return;
}
$fp = fopen($file_path,"r");//打开文件
$file_size = filesize($file_path);//获取文件大小
/*
*下载文件需要用到的header
*/
header("Content-type:application/octet-stream");
header("Accept-Ranges:bytes");
header("Accept-Length:".$file_size);
header("Content-Disposition:attachment;filename=".$file_name);

$buffer=1024;
$file_count=0;
//向浏览器返回数据
while(!feof($fp) && $file_count<$file_size){
 $file_con = fread($fp,$buffer);
 $file_count += $buffer;
 echo $file_con;//这里如果不echo,只会下载到0字节的文件
}
fclose($fp);
&#63;>
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希望本文所述对大家的php程序设计有所帮助。

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