*/ private $attributes = []; /** * @param mixed $value */ public function setAttribute(string $key, $value) : void { $this->attributes[$key] = $value; } public function hasAttribute(string $key) : bool { return array_key_exists($key, $this->attributes); } /** * @return mixed */ public function getAttribute(string $key) { if ($this->hasAttribute($key)) { return $this->attributes[$key]; } return null; } }