yii\mongodb\QueryBuilder::buildBetweenCondition PHP 메소드

    public function buildBetweenCondition($operator, $operands)
    {
        if (!isset($operands[0], $operands[1], $operands[2])) {
            throw new InvalidParamException("Operator '{$operator}' requires three operands.");
        }
        list($column, $value1, $value2) = $operands;
        if (strncmp('NOT', $operator, 3) === 0) {
            return [$column => ['$lt' => $value1, '$gt' => $value2]];
        } else {
            return [$column => ['$gte' => $value1, '$lte' => $value2]];
        }
    }