Solution to the problem of IPV6 ip2long in php_PHP tutorial

function ip2bin($ip)
{
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) !== false)
return base_convert(ip2long($ip),10,2);
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) === false)
return false;
if(($ip_n = inet_pton($ip)) === false) return false;
$bits = 15; // 16 x 8 bit = 128bit (ipv6)
while ($bits >= 0)
    {
        $bin = sprintf("%08b",(ord($ip_n[$bits])));
        $ipbin = $bin.$ipbin;
        $bits--;
    }
    return $ipbin;
}

function bin2ip($bin)
{
   if(strlen($bin) <= 32) // 32bits (ipv4)
return long2ip(base_convert($bin,2,10));
if(strlen($bin) != 128)
return false;
$pad = 128 - strlen($bin);
for ($i = 1; $i <= $pad; $i++)
{
$bin = "0".$bin;
}
$bits = 0;
while ($bits <= 7)
{
$bin_part = substr($bin,($bits*16),16);
$ipv6 .= dechex(bindec($bin_part)).":";
$bits++;
}
return inet_ntop(inet_pton(substr($ipv6,0,-1)));
}
?>