<?PHP
function get_client_language($availableLanguages,$default='en'){
	if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
		$langs=explode(',',$_SERVER['HTTP_ACCEPT_LANGUAGE']);

		foreach ($langs as $value){
			$choice=substr($value,2);
			if(in_array($choice,$availableLanguages)){
				return $choice;
			}
		}
	} 
	return $default;
}

/*** 以上代码来自：编程之家 jb51.cc（jb51.cc） ***/ 
?>