php 验证ip

<?php
function validateIP($ip) {
    if (filter_var($ip, FILTER_VALIDATE_IP)) {
        return "Valid IP address";
    } else {
        return "Invalid IP address";
    }
}

$ip = "192.168.1.1";
echo validateIP($ip); // 输出: Valid IP address

$invalidIp = "300.168.1.1";
echo validateIP($invalidIp); // 输出: Invalid IP address
?>

<?php
function validateIP($ip) {
    if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
        return "Valid IPv6 address";
    } elseif (filter_var($ip, FILTER_VALIDATE_IP)) {
        return "Valid IPv4 address";
    } else {
        return "Invalid IP address";
    }
}

$ipv6 = "2001:0db8:85a3:0000:0000:8a2e:0370:7334";
echo validateIP($ipv6); // 输出: Valid IPv6 address
?>