What's the best way to do IPv6 check in PHP? [closed]

Question

Closed. This question is opinion-based. It is not currently accepting answers.

---

Want to improve this question? Update the question so it can be answered with facts and citations by editing this post.

Closed 8 years ago.

Improve this question

Right now I'm using strcmp but that's not really optimal.

So, what's the best way to do it?

Answer 1

You can also use filter_var :

if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
    echo "IPV6 valid.";
} else {
    echo "Not valid.";
}

You can find the list of filters here.

Answer 2

Use strcmp instead of strcpy. That must be the issue.

Answer 3

You can just check, if a : is in the ip-adress:

if (strpos($_SERVER["REMOTE_ADDR"],":") !== false) //....IPv6
else //....IPv4

Answer 4

Use inet_pton. Also works for ipv4:

function ip_validate($ip){
    return inet_pton($ip) !== false;
}

Answer 5

$_SERVER["REMOTE_ADDR"] this is your buddy. It checks for the adress. I suppose the simplest way would be to check this address for a non-numeric sign. If it contains one, its a IPv6 address. Maybe there are better or more elegant ones, but ive never used it because no provider is using IPv6 yet.