How to check if someone connected via IPv6 / IPv4
I want to check via php if someone connects to my site via IPv4 or IPv6.
The client address can be found in $_SERVER["REMOTE_ADDR"] but how to check if it's IPv4 or IPv6 ?
Check for IPv4
$ip = "255.255.255.255";
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
echo "Valid IPv4";
}
else {
echo "Invalid IPv4";
}
Check for IPv6
$ip = "FE80:0000:0000:0000:0202:B3FF:FE1E:8329";
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
echo "Valid IPv6";
}
else {
echo "Invalid IPv6";
}
For more, check PHP function filter_vars and list of filters for validation .
你可以使用这个：
function ipVersion($txt) {
return strpos($txt, ":") === false ? 4 : 6;
}
What about counting the number of '.' and/or ' : ' in $_SERVER["REMOTE_ADDR"] ?
If there is more than 0 ' : ', and no ' . ' symbol in $_SERVER["REMOTE_ADDR"] , I suppose you can consider you user is connected via IPv6.
Another solution might be to use the filter extension : there are constants (see the end of the page) that seem to be related to IPv4 and IPv6 :
FILTER_FLAG_IPV4 (integer)
Allow only IPv4 address in "validate_ip" filter.
FILTER_FLAG_IPV6 (integer)
Allow only IPv6 address in "validate_ip" filter.
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