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PHP Filter Reference : Check if the variable $ip is a valid IP address
The FILTER_VALIDATE_IP filter validates an IP address.
Possible flags:
Check if the variable $ip is a valid IPv6 address:
<?php
$ip = "2001:0db8:85a3:08d3:1319:8a2e:0370:7334";
if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
echo("$ip is a valid IPv6 address");
} else {
echo("$ip is not a valid IPv6 address");
}
?>
❮ PHP Filter Reference