How to implement simple file download in php, _PHP tutorial

How to implement simple file download in php,

The example in this article describes how to implement simple file downloading in PHP. Share it with everyone for your reference. The details are as follows:

The PHP file download code introduced here simply implements the download function of a picture and is not perfect yet. It is best to encapsulate it into a class or use function calls. Interested friends can improve it on this basis!

The php file download code is as follows:

<&#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;>

I hope this article will be helpful to everyone’s PHP programming design.

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