function offsetexists($key) {
		return Base::instance()->visible($this,$key)?
			isset($this->$key):
			($this->exists($key) && $this->get($key)!==NULL);
	}
function offsetexists($key) {
		return Base::instance()->visible($this,$key)?
			isset($this->$key):
			($this->exists($key) && $this->get($key)!==NULL);
	}
function offsetexists ( $ key ) { return Base :: instance ( ) -> visible ( $ this , $ key ) ? isset ( $ this -> $ key ) : ( $ this -> exists ( $ key ) && $ this -> get ( $ key ) !== NULL ) ; }
Convenience method for checking property value
@return mixed
@param $key string
Convenience method for checking property value