What to do if the file name of php file download is garbled

Solution to the garbled file name of PHP file download: 1. Set "Content-Type" to "application/octet-stream"; 2. Set "header('Content-Disposition: attachment; filename*= "utf8\'\'' . $filename . '"');} else {header(...)" is enough.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

What to do if the php file download file name is garbled

PHP download file name is garbled

By setting Content-Type to application/octet-stream , you can download dynamically generated content as a file, I believe everyone knows this. Then use Content-Disposition to set the downloaded file name. Many people know this. Basically, the download program is written like this:

The code is as follows:

$filename = "document.txt";
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename=' . $filename);
print "Hello!";

After opening it with a browser, you can download document.txt.

However, if $filename is UTF-8 encoded, some browsers cannot handle it properly. For example, slightly change the above program:

The code is as follows:

$filename = "中文 文件名.txt";
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename=' . $filename);
print "Hello!";

Save the program in UTF-8 encoding and then access it, the file name downloaded by IE6 will be garbled. The file name downloaded under FF3 only has the word "Chinese". Everything works fine under Opera 9.

The output header actually looks like this:

Content-Disposition: attachment; filename=Chinese file name.txt In fact, according to the definition of RFC2231, the multi-language encoding Content-Disposition should be defined like this :

The code is as follows:

Content-Disposition: attachment; filename*="utf8''%E4%B8%AD%E6%96%87%20%E6%96%87%E4%BB%B6%E5%90%8D.txt"

That is: *

The value of filename must be added before the equal sign after

The value of filename is divided into three sections with single quotes. They are character set (utf8), language (empty) and urlencoded file name.

It is best to add double quotes, otherwise the part after the space in the file name will not be displayed in Firefox

Note that the result of urlencode is not the same as the result of php's urlencode function. PHP's urlencode Spaces will be replaced, and here they need to be replaced with

After testing, it was found that the support of several mainstream browsers is as follows:

IE6 attachment; filename=""
FF3 attachment; filename="UTF-8文件名"
attachment; filename*="utf8''"
O9 attachment; filename="UTF-8文件名"

Safari3 (Win) does not seem to support it? None of the above methods will work

It seems that the program must be written like this to support all mainstream browsers:

The code is as follows:

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

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