您如何知道用户在浏览器中输入的编码？ [英] How do you know what encoding the user is inputing into the browser?

问题描述

我阅读了 Joel关于角色集的文章，所以我正在采取他的建议在我的网页和我的数据库中使用UTF-8。我不明白的是用户输入怎么办正如乔尔所说：不用知道使用什么编码就没有意义。但是如何知道用户输入字符串使用什么编码？如果我有

I read Joel's article about character sets and so I'm taking his advice to use UTF-8 on my web page and in my database. What I can't understand is what to do with user input. As Joel says, "It does not make sense to have a string without knowing what encoding it uses." But how do I know what encoding the user input string uses? If I have

< input type =textname =atextfield>

在我的页面上，我如何知道从用户那里得到什么编码？如果用户输入一些特殊的ASCII符号，如♣或™？有没有办法可以检测到用户输入给了我一些无法识别的UTF-8？有没有一些如何处理这种事情的标准？

on my page, how do I know what encoding I'm getting from the user? What if the user puts in some special ASCII symbol, like ♣ or ™ or something? Is there some way I can detect that user input gave me something unrecognized in UTF-8? Is there some standard for how to handle this sort of thing?

推荐答案

如果您的网页使用UTF-8，浏览器将转换为UTF-8。所以，即使特殊字符是ASCII，它将以UTF-8的形式提交。

If your web-page using UTF-8, browser will convert to UTF-8 for you. So, even the special characters are in ASCII it will submit as UTF-8.

然而，您从不知道用户将页面编码切换回ISO的痒手-8859 - *。

However, you never know itchy hand from an user that switch back the page encoding to ISO-8859-*.

您可以在 mb_detect_encoding ，但不是100％防弹。

You can make use on mb_detect_encoding, but is not 100% bullet-proof.

/* Detect character encoding with current detect_order */
echo mb_detect_encoding($str);

/* "auto" is expanded to "ASCII,JIS,UTF-8,EUC-JP,SJIS" */
echo mb_detect_encoding($str, "auto");

/* Specify encoding_list character encoding by comma separated list */
echo mb_detect_encoding($str, "JIS, eucjp-win, sjis-win");

/* Use array to specify encoding_list  */
$ary[] = "ASCII";
$ary[] = "JIS";
$ary[] = "EUC-JP";
echo mb_detect_encoding($str, $ary);

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