当前位置： 移动技术网 > IT编程>开发语言>PHP > php利用header函数下载各种文件

php利用header函数下载各种文件

2017年12月12日  | 移动技术网IT编程  | 我要评论

本文实例为大家分享了php header函数下载文件实现代码，供大家参考，具体内容如下


<?php
/**
* 下载文件
* header函数
*
*/


dl_file($_get ['filename']);

function dl_file($file)
{
 $file = ".//images//" . $file;
 //first, see if the file exists
 
 if (! is_file ( $file ))
 {
  die ( "<b>404 file not found!</b>" );
 }
 
 // gather relevent info about file
 $len = filesize ( $file );
 $filename = basename ( $file );
 $file_extension = strtolower ( substr ( strrchr ( $filename, "." ), 1 ) );
 
 // this will set the content-type to the appropriate setting for the file
 switch ($file_extension)
 {
  case "pdf" :
   $ctype = "application/pdf";
   break;
  case "exe" :
   $ctype = "application/octet-stream";
   break;
  case "zip" :
   $ctype = "application/zip";
   break;
  case "doc" :
   $ctype = "application/msword";
   break;
  case "xls" :
   $ctype = "application/vnd.ms-excel";
   break;
  case "ppt" :
   $ctype = "application/vnd.ms-powerpoint";
   break;
  case "gif" :
   $ctype = "image/gif";
   break;
  case "png" :
   $ctype = "image/png";
   break;
  case "jpeg" :
  case "jpg" :
   $ctype = "image/jpg";
   break;
  case "mp3" :
   $ctype = "audio/mpeg";
   break;
  case "wav" :
   $ctype = "audio/x-wav";
   break;
  case "mpeg" :
  case "mpg" :
  case "mpe" :
   $ctype = "video/mpeg";
   break;
  case "mov" :
   $ctype = "video/quicktime";
   break;
  case "avi" :
   $ctype = "video/x-msvideo";
   break;
  
  // the following are for extensions that shouldn't be downloaded
  // (sensitive stuff, like php files)
  case "php" :
  case "htm" :
  case "html" :
  case "txt" :
   die ( "<b>cannot be used for " . $file_extension . " files!</b>" );
   break;
  
  default :
   $ctype = "application/force-download";
 }
 
 
 $file_temp = fopen ( $file, "r" );
 
 
 // begin writing headers
 header ( "pragma: public" );
 header ( "expires: 0" );
 header ( "cache-control: must-revalidate, post-check=0, pre-check=0" );
 header ( "cache-control: public" );
 header ( "content-description: file transfer" );
 // use the switch-generated content-type
 header ( "content-type: $ctype" );
 // force the download
 $header = "content-disposition: attachment; filename=" . $filename . ";";
 header ( $header );
 header ( "content-transfer-encoding: binary" );
 header ( "content-length: " . $len );
 
 
 //@readfile ( $file );
 echo fread ( $file_temp, filesize ( $file ) );
 fclose ( $file_temp );
 
 exit ();
}

?>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。

您可能感兴趣的文章:

如对本文有疑问， 点击进行留言回复！！

相关文章:

验证码：
最近更新的文章
大家感兴趣的文章
移动技术网