PhpBench\Expression\Parser::processExpr PHP Метод

    private function processExpr(array $expr)
    {
        if (count($expr) != 1) {
            $newExpr = [];
            foreach ($expr as $key => $value) {
                $newExpr[] = [$key => $value];
            }
            $expr = ['$and' => $newExpr];
        }
        $left = key($expr);
        $right = current($expr);
        if (substr($left, 0, 1) === '$') {
            return $this->parseComposite($left, $right);
        }
        return $this->parseComparison($left, $right);
    }