PHP로 브라우저 언어 감지하는 코드

function get_client_language($availableLanguages, $default='ko'){

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

		$langs=explode(',',$_SERVER['HTTP_ACCEPT_LANGUAGE']);



		foreach ($langs as $value){

			$choice=substr($value,0,2);

			if(in_array($choice, $availableLanguages)){

				return $choice;

			}

		}

	} 

	return $default;

}