php ip自动跳转

<?php
// 获取用户的IP地址
$user_ip = $_SERVER['REMOTE_ADDR'];

// 定义IP地址范围
$allowed_ips = array(
    '192.168.1.0/24',
    '10.0.0.0/8'
);

// 检查用户的IP地址是否在允许的范围内
$redirect = true;
foreach ($allowed_ips as $ip_range) {
    if (filter_var($user_ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) && ip_in_range($user_ip, $ip_range)) {
        $redirect = false;
        break;
    }
}

// 如果IP地址不在允许的范围内，进行跳转
if ($redirect) {
    header('Location: http://example.com/blocked.html');
    exit();
}

// 继续正常处理请求
echo "Welcome to the website!";
?>

<?php
// 辅助函数：检查IP是否在指定范围内
function ip_in_range($ip, $range) {
    $ip = (double) (sprintf("%u", ip2long($ip)));
    $min = ip2long(substr($range, 0, strpos($range, '.')));
    $max = ip2long(substr($range, -strlen(strstr($range, '.')) + 1));
    return (($ip >= $min) && ($ip <= $max));
}
?>