How to solve 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:

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

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:

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

If you save the program in UTF-8 encoding and then 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=中文 文件名.txt

In fact, according to the definition of RFC2231, the Content-Disposition of multi-language encoding 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"

i.e.:

• Before the equal sign after filename, add *
• The value of 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 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 will replace spaces with +, 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文件名"
	attachment; filename*="utf8"
O9	attachment; filename="UTF-8文件名"
Safari3(Win)	貌似不支持？上述方法都不行

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

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

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