public function __isset($name)
 {
     // hook functions to Hook class
     if (Hooks::isHookFunction($name) || in_array($name, Core::$instanceClasses) || in_array($name, Core::$classes) || in_array($name, Core::$singletonClasses)) {
         return true;
     }
     return false;
 }
 public final function __isset($name)
 {
     // hook functions to Hook class
     if (Hooks::isHookFunction($name)) {
         return true;
     }
     return false;
 }