eZ\Publish\Core\Persistence\Doctrine\DoctrineExpression::basicMath PHP Method

    private function basicMath($type)
    {
        $args = func_get_args();
        $elements = $this->arrayFlatten(array_slice($args, 1));
        if (count($elements) < 1) {
            throw new QueryException("The operation '{$type}' expected at least 1 argument but none provided.");
        }
        if (count($elements) == 1) {
            return $elements[0];
        } else {
            return '( ' . implode(" {$type} ", $elements) . ' )';
        }
    }