PHP检测客户端用户语言函数

function get_client_language($availableLanguages, $default='en'){<br />    if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {<br />        $langs=explode(',',$_SERVER['HTTP_ACCEPT_LANGUAGE']);<br />        foreach ($langs as $value){<br />            $choice=substr($value,0,2);<br />            if(in_array($choice, $availableLanguages)){<br />                return $choice;<br />            }<br />        }<br />    } <br />    return $default;<br />}