paulzi / yii2-nested-intervals

     * @param int $right

     * @return array|null

     */

    protected function findInsertBeforeRange(&$left, &$right)

    {

        $result = null;

        $right = $this->node->getAttribute($this->leftAttribute);

        $left  = $this->getNodeBehavior()->getPrev()

            ->select($this->rightAttribute)

            ->scalar();

        if ($left === false) {

            $result = $this->getNodeBehavior()->getParent()

                ->select([$this->leftAttribute, $this->rightAttribute])

                ->createCommand()

                ->queryOne();

            $left = $result[$this->leftAttribute];

        }

        $left = (int)$left;

        return $result;

    }

    /**

     * @param int $left

     * @param int $right

     * @return array|null

     */

    protected function findInsertAfterRange(&$left, &$right)

    {

        $result = null;

        $left  = $this->node->getAttribute($this->rightAttribute);

        $right = $this->getNodeBehavior()->getNext()

            ->select($this->leftAttribute)

            ->scalar();

        if ($right === false) {

            $result = $this->getNodeBehavior()->getParent()

                ->select([$this->leftAttribute, $this->rightAttribute])

                ->createCommand()

                ->queryOne();

            $right = $result[$this->rightAttribute];

        }

        $right = (int)$right;

        return $result;

    }

    /**

     * @param int $value