PHP implementation code for downloading files and solutions to garbled characters in file names_PHP tutorial

Someone recently asked me how to download files. The php method is as follows:

Copy the code The code is as follows:

header("Content-Type: application/force-download");
header("Content-Disposition: attachment; filename=ins.jpg");
readfile( "imgs/test_Zoom.jpg");
?>

The first line of code is to force download;
The second line of code is to assign a name to the downloaded content;
The third line of code reads the downloaded content into the file.
How to solve garbled characters in PHP download file names
By setting the Content-Type to application/octet-stream, you can download dynamically generated content as a file. I believe everyone will know 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!";
?>

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:

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!";
?>

If you save the program in UTF-8 encoding and access it again, 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:

Copy code 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:
Before the equal sign after filename, add * filename is divided into three segments 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 with + , and 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- 8File name"
Safari3(Win) doesn’t 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:

Copy the code The code is 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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