Illuminate\Database\Eloquent\Model::getArrayableItems PHP Method

    protected function getArrayableItems(array $values)
    {
        if (count($this->getVisible()) > 0) {
            $values = array_intersect_key($values, array_flip($this->getVisible()));
        }
        if (count($this->getHidden()) > 0) {
            $values = array_diff_key($values, array_flip($this->getHidden()));
        }
        return $values;
    }