PHP 检测浏览器语言环境

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PHP 拿到 $_SERVER 的 HTTP_ACCEPT_LANGUAGE值，来判断应该输出的语言。
实际环境中，初次判断后写入cookie，也允许用户选择某种语言后更新 cookie，每次在服务端读取cookie来判断就行了。

<?php
$lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
switch ($lang){
    case "fr":
        //echo "PAGE FR";
        include("index_fr.php");//include check session FR
        break;
    case "it":
        //echo "PAGE IT";
        include("index_it.php");
        break;
    case "en":
        //echo "PAGE EN";
        include("index_en.php");
        break;        
    default:
        //echo "PAGE EN - Setting Default";
        include("index_en.php");//include EN in all other cases of different lang detection
        break;
}
?>
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