private function resolveOperator($symbol, $value)
    {
        if (null === $symbol) {
            return $this->getOperatorByValueType($value);
        }

        return self::$operatorMap[$symbol];
    }
private function resolveOperator($symbol, $value)
    {
        if (null === $symbol) {
            return $this->getOperatorByValueType($value);
        }

        return self::$operatorMap[$symbol];
    }
private function resolveOperator ( $ symbol , $ value ) { if ( null === $ symbol ) { return $ this -> getOperatorByValueType ( $ value ) ; } return self :: $ operatorMap [ $ symbol ] ; }
Resolve actual operator value from the given arguments.

@param string|null $symbol
@param mixed $value

@return string
Resolve actual operator value from the given arguments .