vendor/symfony/http-foundation/IpUtils.php

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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpFoundation;

/**
 * Http utility functions.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class IpUtils
{
    private static $checkedIps = [];

    /**
     * This class should not be instantiated.
     */
    private function __construct()
    {
    }

    /**
     * Checks if an IPv4 or IPv6 address is contained in the list of given IPs or subnets.
     *
     * @param string|array $ips List of IPs or subnets (can be a string if only a single one)
     *
     * @return bool
     */
    public static function checkIp(?string $requestIp, $ips)
    {
        if (null === $requestIp) {
            trigger_deprecation('symfony/http-foundation', '5.4', 'Passing null as $requestIp to "%s()" is deprecated, pass an empty string instead.', __METHOD__);

            return false;
        }

        if (!\is_array($ips)) {
            $ips = [$ips];
        }

        $method = substr_count($requestIp, ':') > 1 ? 'checkIp6' : 'checkIp4';

        foreach ($ips as $ip) {
            if (self::$method($requestIp, $ip)) {
                return true;
            }
        }

        return false;
    }

    /**