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setCacheResult example

    public static function checkIp4(string $requestIp, string $ip): bool
    {
        $cacheKey = $requestIp.'-'.$ip.'-v4';
        if (null !== $cacheValue = self::getCacheResult($cacheKey)) {
            return $cacheValue;
        }

        if (!filter_var($requestIp, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV4)) {
            return self::setCacheResult($cacheKey, false);
        }

        if (str_contains($ip, '/')) {
            [$address, $netmask] = explode('/', $ip, 2);

            if ('0' === $netmask) {
                return self::setCacheResult($cacheKey, false !== filter_var($address, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV4));
            }

            if ($netmask < 0 || $netmask > 32) {
                return self::setCacheResult($cacheKey, false);
            }