blocks|key|1250001|text|浏览器通常发送一个HTTP标头，名称为Accept-Language，它指示用户希望使用哪种语言。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1250002|例如，此标头可以是：|1250003|Accept-Language:+en-us,en;q=0.5|code-block|syntax|javascript|1250004|这里面有优先级的概念，顺便说一句;-)|1250005|在PHP中，你可以在$_SERVER超级全局：|offset|length|style|CODE|1250006|var_dump($_SERVER['HTTP_ACCEPT_LANGUAGE']);|1250007|会让我：|1250008|string+'en-us,en;q=0.5'+(length=14)|1250009|现在，您必须对其进行解析;-)|1250010|如果我在浏览器的选项中编辑我的首选项，说“我想要法语，如果你不能为我提供法语，就从美国给我英语；如果你也不能给我这个，就给我英语)，标题将是：|1250011|Accept-Language:+fr-fr,en-us;q=0.7,en;q=0.3|1250012|并且，来自PHP：|1250013|string+'fr-fr,en-us;q=0.7,en;q=0.3'+(length=26)|1250014|有关更多信息，您可以查看section+14.4+of+the+HTTP+RFC。|1250015|您可能会在PHP语言中找到许多解析该头文件的代码示例；例如：Parse+Accept-Language+to+detect+a+user's+language|1250016|祝你玩得开心！|1250017|entityMap|0|LINK|mutability|MUTABLE|url|http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4|1|http://www.thefutureoftheweb.com/blog/use-accept-language-header^0|0|0|0|0|A|8|0|0|0|0|0|0|0|0|0|C|S|0|0|U|1D|1|0|0^^$0|@$1|2|3|4|5|6|7|1M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|1P|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1Q|8|@$M|1R|N|1S|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|F|7|1T|8|@]|9|@]|A|$G|H]]|$1|S|3|T|5|6|7|1U|8|@]|9|@]|A|$]]|$1|U|3|V|5|F|7|1V|8|@]|9|@]|A|$G|H]]|$1|W|3|X|5|6|7|1W|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1X|8|@]|9|@]|A|$]]|$1|10|3|11|5|F|7|1Y|8|@]|9|@]|A|$G|H]]|$1|12|3|13|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|14|3|15|5|F|7|20|8|@]|9|@]|A|$G|H]]|$1|16|3|17|5|6|7|21|8|@]|9|@$M|22|N|23|1|24]]|A|$]]|$1|18|3|19|5|6|7|25|8|@]|9|@$M|26|N|27|1|28]]|A|$]]|$1|1A|3|1B|5|6|7|29|8|@]|9|@]|A|$]]|$1|1C|3|-4|5|6|7|2A|8|@]|9|@]|A|$]]]|1D|$1E|$5|1F|1G|1H|A|$1I|1J]]|1K|$5|1F|1G|1H|A|$1I|1L]]]]

The browser generally sends a HTTP header, name Accept-Language, that indicates which languages the user is willing to get.

For instance, this header can be :

<pre><code>Accept-Language: en-us,en;q=0.5
</code></pre>

There is notion of priority in it, btw ;-)

In PHP, you can get this in the <code>$_SERVER</code> super global :

<pre><code>var_dump($_SERVER['HTTP_ACCEPT_LANGUAGE']);
</code></pre>

will get me :

<pre><code>string 'en-us,en;q=0.5' (length=14)
</code></pre>

Now, you have to parse that ;-)

 
If I edit my preferences in the browser's option to say "I want french, and if you don't can't serve me french, get me english from the US ; and if you can't get me that either, just get me english), the header will be :

<pre><code>Accept-Language: fr-fr,en-us;q=0.7,en;q=0.3
</code></pre>

And, from PHP :

<pre><code>string 'fr-fr,en-us;q=0.7,en;q=0.3' (length=26)
</code></pre>

 
For more informations, you can take a look at <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4" rel="noreferrer">section 14.4 of the HTTP RFC</a>.

And you probably can find lots of code example in PHP to parse that header ; for instance : <a href="http://www.thefutureoftheweb.com/blog/use-accept-language-header" rel="noreferrer">Parse Accept-Language to detect a user's language</a>

Have fun !

blocks|key|1464893|text|这是我在一个双语网站上使用的脚本。它将用作mysite.com的index.php。根据用户浏览器的语言偏好，如果用户首选语言中的站点不可用，它将重定向到所需的站点语言版本或默认语言站点。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1464894|<?php
//+List+of+available+localized+versions+as+'lang+code'+=>+'url'+map
$sites+=+array(
++++"en"+=>+"http://en.mysite.com/",
++++"bn"+=>+"http://bn.mysite.com/",
);

//+Get+2+char+lang+code
$lang+=+substr($_SERVER['HTTP_ACCEPT_LANGUAGE'],+0,+2);

//+Set+default+language+if+a+`$lang`+version+of+site+is+not+available
if+(!in_array($lang,+array_keys($sites)))
++++$lang+=+'en';

//+Finally+redirect+to+desired+location
header('Location:+'+.+$sites[$lang]);
?>|code-block|syntax|javascript|1464895|entityMap^0|L|A|W|9|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

Here's the script I used for a bi-lingual site. It is to be used as <code>index.php</code> of <code>mysite.com</code>. Based on the user's browser's language preference, it would redirect to desired language version of the site or the default language site if the site in user's preferred langauge was not available.

<pre><code>&lt;?php
// List of available localized versions as 'lang code' =&gt; 'url' map
$sites = array(
 "en" =&gt; "http://en.mysite.com/",
 "bn" =&gt; "http://bn.mysite.com/",
);

// Get 2 char lang code
$lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);

// Set default language if a `$lang` version of site is not available
if (!in_array($lang, array_keys($sites)))
 $lang = 'en';

// Finally redirect to desired location
header('Location: ' . $sites[$lang]);
?&gt;
</code></pre>

blocks|key|1464959|text|您的代码看起来很好。如果访问者要求提供您没有提供的语言，您可能希望添加最终的else默认选择。此外，如果访问者自己选择了一种语言，您应该将该选择保存在持久cookie中并检查其值，使其优先于HTTP_ACCEPT_LANGUAGE。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1464960|据我所知，Youtube确实使用HTTP_ACCEPT_LANGUAGE，但如果访问者所在国家的语言与此不匹配，它会同时使用IP地理定位来建议更改语言。绝对很烦人。|1464961|吹毛求疵:如果要将语言添加到列表中，switch()语句可能更具可读性。|1464962|entityMap^0|12|4|0|0|I|8|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|K|$]]

Your code looks just fine. You might want to add a final <code>else</code> default choice if the visitor asks for a language you aren't providing.
Also, if the visitor himself selects a language you should save that choice in a persistent cookie and check its value, giving it precedence over HTTP_ACCEPT_LANGUAGE.

As far as I can tell Youtube does use HTTP_ACCEPT_LANGUAGE, but at the same time uses IP geolocation to suggest a change in language if the langauge of the visitor's country doesn't match that. Definitely annoying.

Just nitpicking: if you're gonna add languages to the list a <code>switch()</code> statement might be more readable.

blocks|key|1464978|text|if(isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])){
++++$parts=explode(';',$_SERVER['HTTP_ACCEPT_LANGUAGE']);
++++$langs=explode(',',$parts[0]);
++++var_dump($langs);
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1464979|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>if(isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])){
 $parts=explode(';',$_SERVER['HTTP_ACCEPT_LANGUAGE']);
 $langs=explode(',',$parts[0]);
 var_dump($langs);
}
</code></pre>

blocks|key|1465024|text|我知道已经有很多好的解决方案，但我已经找到了自己的方法来解决这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1465025|<?php
++$prefLocales+=+array_reduce(
++++explode(',',+$_SERVER['HTTP_ACCEPT_LANGUAGE']),+
++++++function+($res,+$el)+{+
++++++++list($l,+$q)+=+array_merge(explode(';q=',+$el),+[1]);+
++++++++$res[$l]+=+(float)+$q;+
++++++++return+$res;+
++++++},+[]);
++++arsort($prefLocales);
++++/*
++++This+get+you+from+headers+like+this
++++++string+'en-US,en;q=0.8,uk;q=0.6,ru;q=0.4'+(length=32)
++++array+like+this
++++array+(size=4)
++++++'en-US'+=>+float+1
++++++'en'+=>+float+0.8
++++++'uk'+=>+float+0.6
++++++'ru'+=>+float+0.4
++++*/|code-block|syntax|javascript|1465026|代码会将HTTP_ACCEPT_LANGUAGE字符串转换为以区域设置为键、以权重为值的数组，从高到低排序。因此，您可以使用array_shift逐个获取，以获得与您的站点区域设置最佳匹配。|1465027|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I know there already many good solutions, but have found my own way to solve this problem.

<pre><code>&lt;?php
 $prefLocales = array_reduce(
 explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']), 
 function ($res, $el) { 
 list($l, $q) = array_merge(explode(';q=', $el), [1]); 
 $res[$l] = (float) $q; 
 return $res; 
 }, []);
 arsort($prefLocales);
 /*
 This get you from headers like this
 string 'en-US,en;q=0.8,uk;q=0.6,ru;q=0.4' (length=32)
 array like this
 array (size=4)
 'en-US' =&gt; float 1
 'en' =&gt; float 0.8
 'uk' =&gt; float 0.6
 'ru' =&gt; float 0.4
 */
</code></pre>

Code will convert HTTP_ACCEPT_LANGUAGE string to array with locales as keys and weight as values, sorted from high value to low. So you can just get one by one with array_shift to get the best match with your site locales.

blocks|key|1250253|text|这也是可能的。如果.php不可用，它将默认使用英语。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1250254|$lang+=+substr($_SERVER['HTTP_ACCEPT_LANGUAGE'],+0,+2);
(@include_once+'languages/'.$lang.'.php')+or+(@include_once+'languages/en.php');+|code-block|syntax|javascript|1250255|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is also possible. It will use english as default if .php is not available.

<pre><code>$lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
(@include_once 'languages/'.$lang.'.php') or (@include_once 'languages/en.php'); 
</code></pre>

blocks|key|1465122|text|这是一个从一组受支持的语言中选择最佳语言的函数。它从Accept-Language中提取语言，然后根据语言的优先级对给定的语言数组进行排序。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1465123|function+select_best_language($languages)+{
++++if+(!$_SERVER['HTTP_ACCEPT_LANGUAGE'])+return+$languages[0];
++++$default_q=100;
++++foreach+(explode(",",$_SERVER['HTTP_ACCEPT_LANGUAGE'])+as+$lqpair)+{
++++++++$lq=explode(";q=",$lqpair);
++++++++if+($lq[1])+$lq[1]=floatval($lq[1]);+else+$lq[1]=$default_q--;
++++++++$larr[$lq[0]]=$lq[1];
++++}
++++usort($languages,function($a,$b)+use+($larr)+{+return+$larr[$b]<=>$larr[$a];+});
++++return+$languages[0];
}

$lang+=+select_best_language(['en','fr','it']);|code-block|syntax|javascript|1465124|entityMap^0|Q|F|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Here's a function for selecting the best out of a group of supported languages. It extracts languages from <code>Accept-Language</code>, then sorts the given array of languages according to their priority.

<pre class="lang-php prettyprint-override"><code>function select_best_language($languages) {
 if (!$_SERVER['HTTP_ACCEPT_LANGUAGE']) return $languages[0];
 $default_q=100;
 foreach (explode(",",$_SERVER['HTTP_ACCEPT_LANGUAGE']) as $lqpair) {
 $lq=explode(";q=",$lqpair);
 if ($lq[1]) $lq[1]=floatval($lq[1]); else $lq[1]=$default_q--;
 $larr[$lq[0]]=$lq[1];
 }
 usort($languages,function($a,$b) use ($larr) { return $larr[$b]&lt;=&gt;$larr[$a]; });
 return $languages[0];
}

$lang = select_best_language(['en','fr','it']);
</code></pre>

blocks|key|1250365|text|我用下面的代码为PHP7.4%2B解决了这个问题。它去掉了区域设置代码的前两个字母，考虑了'en-US‘之类的情况，并生成了一个如下所示的映射：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1250366|$map+=+[
++++'en'+=>+1,
++++'de'+=>+0.8,
++++'uk'+=>+0.3
];|code-block|syntax|javascript|1250367|代码如下：|1250368|$header++=+'en-US,de-DE;q=0.8,uk;q=0.3';
$pattern+=+'((?P<code>[a-z-_A-Z]{2,5})([;q=]%2B?(?P<prio>0.\d%2B))?)';

preg_match_all($pattern,+$header,+$matches);
['code'+=>+$codes,+'prio'+=>+$values]+=+$matches;

$map+=+\array_combine(
++++\array_map(fn(string+$language)+=>+strtolower(substr($language,+0,+2)),+\array_values($codes)),
++++\array_map(fn(string+$value)++++=>+empty($value)+?+1+:+(float)$value,+\array_values($values))
);|1250369|请注意，正则表达式可能不是最优的，欢迎提出改进建议。命名捕获组始终按匹配顺序排列，因此我们可以安全地使用array_combine。|1250370|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I solved this issue for PHP7.4+ with the code below. It strips out the first two letters of the locale code, takes into account cases like 'en-US' and produces a map like:
<pre class="lang-php prettyprint-override"><code>$map = [
 'en' =&gt; 1,
 'de' =&gt; 0.8,
 'uk' =&gt; 0.3
];
</code></pre>
The code is as follows:
<pre class="lang-php prettyprint-override"><code>
$header = 'en-US,de-DE;q=0.8,uk;q=0.3';
$pattern = '((?P&lt;code&gt;[a-z-_A-Z]{2,5})([;q=]+?(?P&lt;prio&gt;0.\d+))?)';

preg_match_all($pattern, $header, $matches);
['code' =&gt; $codes, 'prio' =&gt; $values] = $matches;

$map = \array_combine(
 \array_map(fn(string $language) =&gt; strtolower(substr($language, 0, 2)), \array_values($codes)),
 \array_map(fn(string $value) =&gt; empty($value) ? 1 : (float)$value, \array_values($values))
);

</code></pre>
Please note that the regex is probably suboptimal, improvement suggestions are welcome.
Named capture groups are always in the order of matching, so we can use array_combine safely.

I'm trying to build multilangual site.

I use this piece of code to detect users language. If you havent chosen a language, it will include your language file based on <code>HTTP_ACCEPT_LANGUAGE</code>.

I don't know where it gets it from though:

<pre><code>session_start();

if (!isset($_SESSION['lang'])) {
 $_SESSION['lang'] = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
}

elseif (isset($_GET['setLang']) &amp;&amp; $_GET['setLang'] == 'en') $_SESSION['lang'] = "en";
elseif (isset($_GET['setLang']) &amp;&amp; $_GET['setLang'] == 'sv') $_SESSION['lang'] = "sv";
elseif (isset($_GET['setLang']) &amp;&amp; $_GET['setLang'] == 'pl') $_SESSION['lang'] = "pl";
elseif (isset($_GET['setLang']) &amp;&amp; $_GET['setLang'] == 'fr') $_SESSION['lang'] = "fr";

include('languages/'.$_SESSION['lang'].'.php');
</code></pre>

It works for me and includes the polish lang file. But is this code accurate? Or is there another way?

PHP language detection

PHP语言

我正在尝试建立多语言站点。我使用这段代码来检测用户的语言。如果您尚未选择语言，它将包含基于HTTP_ACCEPT_LANGUAGE的语言文件。我不知道它是从哪里来的：session_start();if (!isset($_SESSION['lang'])) {   $_SESSION['lang'] = substr...

问PHP语言检测
EN

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