ipfilter form array()

gistfile1.aw

<?php
    /**
     * Checks to see if the user IP is allowed by {@link ipFilters}.
     * @param string $ip the user IP
     * @return boolean whether the user IP is allowed by {@link ipFilters}.
     */
    protected function allowIp($ip)
    {
        foreach ($this->ipFilters as $filter)
        {
            $filter = trim($filter);
            // normal or incomplete IPv4
            if (preg_match('/^[\d\.]*\*?$/', $filter)) {
                $filter = rtrim($filter, '*');
                if (strncmp($ip, $filter, strlen($filter)) === 0)
                {
                    return true;
                }
            }
            // CIDR
            else if (preg_match('/^([\d\.]+)\/(\d+)$/', $filter, $match))
            {
                if (self::matchIpMask($ip, $match[1], $match[2]))
                {
                    return true;
                }
            }
            // IPv6
            else if ($ip === $filter)
            {
                return true;
            }
        }
        return false;
    }

    /**
     * Check if an IP matches a CIDR mask.
     *
     * @param integer|string $ip IP to check.
     * @param integer|string $matchIp Radical of the mask (e.g. 192.168.0.0).
     * @param integer $maskBits Size of the mask (e.g. 24).
     */
    protected static function matchIpMask($ip, $maskIp, $maskBits)
    {
        $mask =~ (pow(2, 32-$maskBits)-1);
        if (false === is_int($ip))
        {
            $ip = ip2long($ip);
        }
        if (false === is_int($maskIp))
        {
            $maskIp = ip2long($maskIp);
        }
        if (($ip & $mask) === ($maskIp & $mask))
        {
            return true;
        } else {
            return false;
        }
    }

From: YiiDebugToolbar