PHP implements downloading of files in multiple formats and solves garbled code problems

I have been working on a project for the past few days and I have encountered a problem. It is easy to download general files, but it is more difficult to download files in Chinese and in multiple formats. I have been fixing the bug for a long time,

It is finally completed. , the following points need to be noted:

1. For files with Chinese file names, remember to transcode to prevent Chinese garbled characters, because the encoding of most hosts is GB2312, and we use It is UTF-8,

so must use the iconv() function to transcode before operation to prevent the file from being found and reporting an error.

2. You need to judge the format of the file to be downloaded, and then write the header() function according to the format.

The specific code is as follows:

<?php header("Content-type:text/html;charset=utf-8");
	
        $filename = "大学英语选课说明.docx";  //文件名
	$filename = iconv("utf-8","gb2312//IGNORE",$filename);  //转码
	$file = "upload/".$filename;  //文件路径
	$len = filesize($file);  //文件大小
        $file_extension = strtolower(substr(strrchr($filename,"."),1));  //文件后缀名
 
    switch( $file_extension )   //判断文件类型
    {
      case "pdf": $ctype="application/pdf"; break;
      case "exe": $ctype="application/octet-stream"; break;
      case "zip": $ctype="application/zip"; break;
      case "docx":
      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;
 
      case "php":
      case "htm":
      case "html": die("<b>Cannot be used for ". $file_extension ." files!"); break;
 
      default: $ctype="application/force-download";
    }
 
    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");
     
    header("Content-Type: $ctype");
 
    $header="Content-Disposition: attachment; filename=".$filename.";";
    header($header);
    header("Content-Transfer-Encoding: binary");
    header("Content-Length: ".$len);
    readfile($file);

?> 

To adapt to different browsers and avoid Chinese garbled errors, I found a piece of code on the Internet that can be avoided. The code is as follows:

<?php <span style="white-space:pre">	$ua = $_SERVER["HTTP_USER_AGENT"];
 
<span style="white-space:pre">	</span>$filename = "中文 文件名.txt";
<span style="white-space:pre">	</span>$encoded_filename = urlencode($filename);
<span style="white-space:pre">	</span>$encoded_filename = str_replace("+", "%20", $encoded_filename);
 
<span style="white-space:pre">	</span>header('Content-Type: application/octet-stream');
 
<span style="white-space:pre">	</span>if (preg_match("/MSIE/", $ua)) {
    <span style="white-space:pre">		</span>header('Content-Disposition: attachment; filename="' . $encoded_filename . '"');
<span style="white-space:pre">	</span>} else if (preg_match("/Firefox/", $ua)) {
    <span style="white-space:pre">		</span>header('Content-Disposition: attachment; filename*="utf8\'\'' . $filename . '"');
<span style="white-space:pre">	</span>} else {
    <span style="white-space:pre">		</span>header('Content-Disposition: attachment; filename="' . $filename . '"');
<span style="white-space:pre">	</span>}
 
?>

Me The reason why this code is not used is that I tried the code I wrote above on browsers such as Firefox, IE, Opera, 360, etc., and no garbled errors occurred due to browser problems

. I think it is transcoding. The problem of garbled Chinese characters is basically solved.

My own experience, for reference only!

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The above has introduced how PHP can download files in multiple formats and solve the problem of garbled characters, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.