我在PHP中这样做。接受语言是一件复杂的事情。浏览器可以建议它想要接受的多种语言(每种语言都有一个显示它更喜欢的品质因子)。

不幸的是，我的网站只有主要语言(EN，ES，FR)的翻译，而不是(en_US，en_GB，es_MX，es_ES)，因此我选择了这些主要语言中指定的最高质量因子。

下面是一个未经测试的编辑，它应该从我的代码中删除大多数或所有依赖项。对不起，事情让我以前的答案感到困惑。我对我的函数进行了几次调用，并在其他地方进行了一些语言检查。下面的代码应该设置会话语言变量，您应该在其他地方使用它来确定正确的翻译。

它似乎比我以前的答案复杂得多，我不得不在我自己的代码中实现它。对于需要特定翻译(EN_US，EN_GB)的人，应修改以下代码以考虑preg_match_all中的匹配2。

$websiteLanguages = array('EN', 'ES');

session_start();

// The user wants a specific language regardless of their accept settings.

if (isset($_GET["lang"]))

{

$_SESSION["language"] = $_GET["lang"];

return;

}

// A language has already been decided upon.

if (isset($_SESSION["language"]))

{

return;

}

// No language has been chosen we should choose from the accept language.

if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE']))

{

// Parse the Accept-Language according to:

// http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4

preg_match_all(

'/([a-z]{1,8})' . // M1 - First part of language e.g en

'(-[a-z]{1,8})*\s*' . // M2 -other parts of language e.g -us

// Optional quality factor M3 ;q=, M4 - Quality Factor

'(;\s*q\s*=\s*((1(\.0{0,3}))|(0(\.[0-9]{0,3}))))?/i',

$_SERVER['HTTP_ACCEPT_LANGUAGE'],

$langParse);

$langs = $langParse[1]; // M1 - First part of language

$quals = $langParse[4]; // M4 - Quality Factor

$numLanguages = count($langs);

$langArr = array();

for ($num = 0; $num < $numLanguages; $num++)

{

$newLang = strtoupper($langs[$num]);

$newQual = isset($quals[$num]) ?

(empty($quals[$num]) ? 1.0 : floatval($quals[$num])) : 0.0;

// Choose whether to upgrade or set the quality factor for the

// primary language.

$langArr[$newLang] = (isset($langArr[$newLang])) ?

max($langArr[$newLang], $newQual) : $newQual;

}

// sort list based on value

// langArr will now be an array like: array('EN' => 1, 'ES' => 0.5)

arsort($langArr, SORT_NUMERIC);

// The languages the client accepts in order of preference.

$acceptedLanguages = array_keys($langArr);

// Set the most preferred language that we have a translation for.

foreach ($acceptedLanguages as $preferredLanguage)

{

if (in_array($preferredLanguage, $websiteLanguages))

{

$_SESSION['Language'] = $preferredLanguage;

return;

}

}

}

// We will have returned by now if a language could be chosen, otherwise use

// our default language.

$_SESSION['Language'] = "EN";