public function isExist($key = null)
	{
		return $key = is_null($key) ? false : ($this->find($key) ? true : false);
	}
public function isExist($key = null)
	{
		return $key = is_null($key) ? false : ($this->find($key) ? true : false);
	}
public function isExist ( $ key = null ) { return $ key = is_null ( $ key ) ? false : ( $ this -> find ( $ key ) ? true : false ) ; }
Checks if the given item exists in the array
that is currently available after find call
@return mixed
Checks if the given item exists in the array that is currently available after find call