How to download files using PHP

This article mainly introduces the sample code for file downloading in PHP. Has very good reference value. Let’s take a look with the editor below

Without further ado, please look at the code:

<?php

/**
*
*参数说明：
*
*  $file_name  文件名（中英文）
*  $_SERVER[&#39;DOCUMENT_ROOT&#39;]  获取apache所在路径
*
*/

function download($file_name){
   //对中文文件名进行转码
    $file_name=iconv("UTF-8","GB2312",$file_name);  
     //文件绝对路径：E:/wamp/www."/Demo/Object/DownfileSource/".qq.txt
    $filepath = $_SERVER[&#39;DOCUMENT_ROOT&#39;]."/Demo/Object/DownfileSource/".$file_name;  

     if(!file_exists($filepath)){ //检查文件是否存在
      echo "该文件不存在！";
     return;
     }

     $fp = fopen($filepath, &#39;r&#39;);  //打开文件
      $file_size = filesize($filepath);  //计算文件大小
      if ($file_size>1) {
       echo "<script>window.alert(&#39;文件过大，您没权限下载&#39;)</script>";
       return;
      }

     //HTTP头部信息
      header("Content-type: application/octet-stream");
      header("Accept-Ranges: bytes");
    header("Accept-Length: ".$file_size);
      header("Content-Disposition: attachment; filename=".$file_name);

      //输出文件内容 echo fread($fp, $file_size);

    $buffer = 1024;
    //为了下载安全，做一个文件字节读取计数器
    $file_count = 0;
    //判断文件是否结束 feof
    while (!feof($fp) && ($file_size-$file_count > 0)) {

      $file_data = fread($fp, $buffer); //统计读了多少字节
      $file_count+=$buffer;

      echo "$file_data"; //把数据会送给浏览器
    }
     fclose($fp);
}
//调用
 download("qq.txt"); //只需填写文件名即可
?>

above That’s the entire content of this article, I hope it will be helpful to everyone’s study.

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