我需要一个code例子或库，将解析接受语言头，回到了我preferred语言。 RFC2616 说：

I need a code example or library which would parse Accept-Language header and return me preferred language. RFC2616 states that:

在Accept-Language请求标头字段类似于Accept，但是   限制集自然语言是pferred为$ P $的   响应于该请求。语言标签在3.10节定义。

The Accept-Language request-header field is similar to Accept, but restricts the set of natural languages that are preferred as a response to the request. Language tags are defined in section 3.10.

   Accept-Language = "Accept-Language" ":"
                     1#( language-range [ ";" "q" "=" qvalue ] )
   language-range  = ( ( 1*8ALPHA *( "-" 1*8ALPHA ) ) | "*" ) 

每个语言范围内，可给予相关的质量值   再presents用户的preference的语言估计   由该范围内指定。质量值默认为Q = 1。

Each language-range MAY be given an associated quality value which represents an estimate of the user's preference for the languages specified by that range. The quality value defaults to "q=1".

延伸阅读表明，有太多的可选，应该，可能和演讲中指出$ P $的其他轮流从重新发明轮子pvent我 - 我所想知道的是什么语言的用户prefers，任何浏览器回答了这个问题，每天十亿倍。

Further reading shows that there are too many "optional", "should", "may" and other turns of speech that prevent me from reinventing the wheel - all I want to know is what language user prefers, any browser answers this question billion times a day.

在任何语言中的任何code段（除Lisp和汇编，请）将是有益的。

Any code snippet in any language (except Lisp and Assembler please) would be helpful.

提前感谢！

推荐答案

试试这个，它在PHP，但使用相同的正则表达式我敢肯定，它适用于任何语言：

Try this, its in PHP but using the same regex i'm sure its adaptable to any language :

$langs = array(); // used to store values

if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
    // break up string into pieces (languages and q factors)
    preg_match_all('/([a-z]{1,8}(-[a-z]{1,8})?)\s*(;\s*q\s*=\s*(1|0\.[0-9]+))?/i', $_SERVER['HTTP_ACCEPT_LANGUAGE'], $lang_parse);

    if (count($lang_parse[1])) {
        // create a list like "en" => 0.8
        $langs = array_combine($lang_parse[1], $lang_parse[4]);

        // set default to 1 for any without q factor
        foreach ($langs as $lang => $val) {
            if ($val === '') $langs[$lang] = 1;
        }

        // sort list based on value 
        arsort($langs, SORT_NUMERIC);
    }
}

产生一个排序的数组preferred语言第一：

produces a sorted array with preferred language first :

Array
(
    [en-ca] => 1
    [en] => 0.8
    [en-us] => 0.6
    [de-de] => 0.4
    [de] => 0.2
)

从例如 ACCEPT_LANGUAGE 标题： EN-CA，连接; Q = 0.8，EN-US; Q = 0.6，去德;问= 0.4，日; Q = 0.2

工作实例

Working example here