public function get($key)
 {
     switch ($key) {
         case 'wp_vers':
             return NULL;
         case 'plugin_dir':
         case 'plugin_url':
         case 'plugin_basename':
         case 'textdomain_loaded':
         case 'encoding_converted':
         case 'theme':
         case 'theme_root':
         case 'theme_root_uri':
         case 'template_dir':
         case 'template_uri':
             return $this->{$key};
         default:
             if (!$this->ktai) {
                 return KtaiServices::get($key);
             }
             return $this->ktai->get($key);
     }
 }