yii\db\QueryBuilder::buildLimit PHP Method

    public function buildLimit($limit, $offset)
    {
        $sql = '';
        if ($this->hasLimit($limit)) {
            $sql = 'LIMIT ' . $limit;
        }
        if ($this->hasOffset($offset)) {
            $sql .= ' OFFSET ' . $offset;
        }
        return ltrim($sql);
    }