Respect\Validation\Rules\AbstractSearcher::validateEquals PHP Метод

    protected function validateEquals($input)
    {
        if (is_array($this->haystack)) {
            return in_array($input, $this->haystack);
        }
        if ($input === null || $input === '') {
            return $input == $this->haystack;
        }
        return false !== mb_stripos($this->haystack, $input, 0, mb_detect_encoding($input));
    }