yii\base\Component::__isset PHP Méthode

    public function __isset($name)
    {
        $getter = 'get' . $name;
        if (method_exists($this, $getter)) {
            return $this->{$getter}() !== null;
        } else {
            // behavior property
            $this->ensureBehaviors();
            foreach ($this->_behaviors as $behavior) {
                if ($behavior->canGetProperty($name)) {
                    return $behavior->{$name} !== null;
                }
            }
        }
        return false;
    }

 /**
  * @inheritdoc
  */
 public function __isset($name)
 {
     if (property_exists($this->obj, $name)) {
         return $this->obj->{$name} !== null;
     }
     return parent::__isset($name);
 }