PHP Function that returns page language

getPageLanguage.php

<?php

function getLang(array $request, $default)
{
  return
    !empty($request['get']['lang']) ? $request['get']['lang'] :
      (!empty($request['cookie']['lang']) ? $request['cookie']['lang'] :
        (!empty($request['session']['lang']) ? $request['session']['lang'] :
          (!empty($request['server']['HTTP_ACCEPT_LANGUAGE']) ? substr($request['server']['HTTP_ACCEPT_LANGUAGE'], 0, 2) : $default)));
}