问存储在数据库中的PHP IPv4和IPv6函数

EN

function ipCheck()
{
    // Get IP Address
        if (!empty($_SERVER['HTTP_CLIENT_IP'])) // Shared client
        {
            $ipAddress = $_SERVER['HTTP_CLIENT_IP'];
        }
        else if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) // Proxy address
        {
            $ipAddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
        }
        else
        {
            $ipAddress = $_SERVER['REMOTE_ADDR']; // User viewing
        }

    // Over IP for testing
        /*
            IP Examples for testing

            IPv4:   64.233.160.0
            IPv6:   2607:f0d0:1002:51::4
            IPv6:   2607:f0d0:1002:0051:0000:0000:0000:0004
        */

        $ipAddress = '2607:f0d0:1002:0051:0000:0000:0000:0004'; // Comment out this line for actual IP

    // Validate IP
        if (filter_var($ipAddress, FILTER_VALIDATE_IP))
        {
            if (strpos($ipAddress, ':') !== false)
            {
                $ipType = 'IPv6';
                $ipAddressDB = inet_pton($ipAddress);
            }
            else
            {
                $ipType = 'IPv4';
                $ipAddressDB = ip2long($ipAddress);
            }
        }
        else
        {
            $ipType = 'Invalid';
            $ipAddressDB = $ipAddress;
        }

    // Display results
        echo '<strong>IP Type: </strong>'.$ipType.'<br />',
             '<strong>IP Address: </strong>'.$ipAddress.'<br />',
             '<strong>DatabaseIP: </strong>'.$ipAddressDB;
}

ipCheck();