Analyze how to solve the problem of garbled characters in PHP download file names_PHP tutorial

By setting Content-Type to application/octet-stream, dynamically generated content can be downloaded 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:

Copy code The code is as follows:

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

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

Copy the code The code is as follows:

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

The output header is actually like this:
Content-Disposition: attachment; filename=Chinese file name.txt is actually according to the definition of RFC2231 , multi-language encoding Content-Disposition should be defined like this:
Content-Disposition: attachment; filename*="utf8''%E4%B8%AD%E6%96%87%20%E6 %96%87%E4%BB%B6%E5%90%8D.txt" that is:
•Before the equal sign after filename, add *
•The value of filename is divided into three paragraphs with single quotes , which are character set (utf8), language (empty) and urlencoded file name.
•It is best to add double quotes, otherwise the part after the spaces 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 will replace the spaces. into +, and here it needs to be replaced with %20
After testing, it was found that the support of several mainstream browsers is as follows:
IE6
attachment; filename=""
FF3
attachment; filename="UTF-8 file name"
attachment; filename*="utf8''"
O9
attachment; filename="UTF- 8The file name "
Safari3(Win)
seems not supported? None of the above methods will work
It seems that the program must be written like this to support all major browsers:

Copy code Code As follows:

$ua = $_SERVER["HTTP_USER_AGENT"];
$filename = "Chinese file name.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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