Neos\Flow\Validation\Validator\StringLengthValidator::isValid PHP Method

    protected function isValid($value)
    {
        if ($this->options['maximum'] < $this->options['minimum']) {
            throw new InvalidValidationOptionsException('The \'maximum\' is less than the \'minimum\' in the StringLengthValidator.', 1238107096);
        }
        if (is_object($value)) {
            if (!method_exists($value, '__toString')) {
                $this->addError('The given object could not be converted to a string.', 1238110957);
                return;
            }
        } elseif (!is_string($value)) {
            $this->addError('The given value was not a valid string.', 1269883975);
            return;
        }
        $stringLength = Unicode\Functions::strlen($value);
        $isValid = true;
        if ($stringLength < $this->options['minimum']) {
            $isValid = false;
        }
        if ($stringLength > $this->options['maximum']) {
            $isValid = false;
        }
        if ($isValid === false) {
            if ($this->options['minimum'] > 0 && $this->options['maximum'] < PHP_INT_MAX) {
                $this->addError('The length of this text must be between %1$d and %2$d characters.', 1238108067, [$this->options['minimum'], $this->options['maximum']]);
            } elseif ($this->options['minimum'] > 0) {
                $this->addError('This field must contain at least %1$d characters.', 1238108068, [$this->options['minimum']]);
            } else {
                $this->addError('This text may not exceed %1$d characters.', 1238108069, [$this->options['maximum']]);
            }
        }
    }