PHP script to block vpn networks

<?php

// List of VPN IP addresses to block
$vpn_ips = array(
'10.0.0.0/8',
'172.16.0.0/12',
'192.168.0.0/16',
'103.243.24.0/24',
// Add more IP addresses here as needed
);

// Get the user’s IP address
$user_ip = $_SERVER['REMOTE_ADDR'];

// Check if the user’s IP address is within any of the VPN networks
foreach ($vpn_ips as $vpn_ip) {
if (ip_in_range($user_ip, $vpn_ip)) {
// User is using a VPN, block access
header('HTTP/1.1 403 Forbidden');
echo 'Access denied. Please disable your VPN to access this site.';
exit;
}
}

// User is not using a VPN, allow access
echo 'Welcome to the site!';

// Function to check if an IP address is within a network range
function ip_in_range($ip, $range) {
list($subnet, $mask) = explode('/', $range);
$subnet = ip2long($subnet);
$mask = ~((1 << (32 - $mask)) - 1);
$ip = ip2long($ip);
return ($ip & $mask) == $subnet;
}