framework/validators/CompareValidator.php
protected function validateValue($value)
    {
        if ($this->compareValue === null) {
            throw new InvalidConfigException('CompareValidator::compareValue must be set.');
        }
        if (!$this->compareValues($this->operator, $this->type, $value, $this->compareValue)) {
            return [$this->message, [
                'compareAttribute' => $this->compareValue,
                'compareValue' => $this->compareValue,
                'compareValueOrAttribute' => $this->compareValue,
            ]];
        }

        return null;
    }
protected function validateValue($value)
    {
        if ($this->compareValue === null) {
            throw new InvalidConfigException('CompareValidator::compareValue must be set.');
        }
        if (!$this->compareValues($this->operator, $this->type, $value, $this->compareValue)) {
            return [$this->message, [
                'compareAttribute' => $this->compareValue,
                'compareValue' => $this->compareValue,
                'compareValueOrAttribute' => $this->compareValue,
            ]];
        }

        return null;
    }
{@inheritdoc}