Detailed explanation of PHP implementation file download, _PHP tutorial

Detailed explanation of file download in PHP,

1. PHP download schematic

2. File download source code :

Copy code The code is as follows:

$file_name="haha.jpg";//File to be downloaded
$file_name=iconv("utf-8","gb2312","$file_name");
$fp=fopen($file_name,"r+");//To download a file, you must first open the file and write it into the memory
if(!file_exists($file_name)){//Determine whether the file exists
echo "File does not exist";
exit();
}
$file_size=filesize("a.jpg");//Judge file size
//Returned file
Header("Content-type: application/octet-stream");
//Return in byte format
Header("Accept-Ranges: bytes");
//Return file size
Header("Accept-Length: ".$file_size);
//Pop up the client dialog box, corresponding file name
Header("Content-Disposition: attachment; filename=".$file_name);
//Prevent the server from increasing instantaneous pressure and read in segments
$buffer=1024;
while(!feof($fp)){
$file_data=fread($fp,$buffer);
echo $file_data;
}
//Close file
fclose($fp);
?>

3. Solution to file encoding problem:

If the file name is Chinese, the php function cannot recognize the Chinese file name. Generally, if the program encoding is utf-8, the php function is relatively old and can only recognize gb2312 encoded Chinese, so use iconv("original encoding" for Chinese ", "Encoding to be converted to", "String to be transcoded") function can be transcoded.

For example, convert a string from utf-8 to gb2312

$file_name=iconv(“utf-8”,”gb2312”,”$file_name”);

4 Use header method to implement file download source code

Attached is the download method, which has been packaged and can be used directly:

Copy code The code is as follows:

Function download_by_path($path_name, $save_name){
          ob_end_clean();
            $hfile = fopen($path_name, "rb") or die("Can not find file: $path_namen");
Header("Content-type: application/octet-stream");
Header("Content-Transfer-Encoding: binary");
Header("Accept-Ranges: bytes");
Header("Content-Length: ".filesize($path_name));
Header("Content-Disposition: attachment; filename="$save_name"");
​​​​​while (!feof($hfile)) {
echo fread($hfile, 32768);
         }
             fclose($hfile);
}

The above is the entire content of this article. Do you guys have a preliminary understanding of how to implement file download in PHP? Try it yourself and combine it with the simple examples given in this article to make your project more perfect.

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