What are the limitations of using IP-based bans for user restrictions?

Using IP-based bans for user restrictions has limitations because IP addresses can be easily changed or masked using VPNs or proxies. To improve user restrictions, consider implementing a combination of IP-based bans with other authentication methods such as user accounts, email verification, or CAPTCHA. 

// Example code snippet using a combination of IP-based bans and user authentication

// Check if the user is banned based on their IP address
$ip_address = $_SERVER['REMOTE_ADDR'];
if(is_ip_banned($ip_address)) {
    // Redirect the user to a banned page or display an error message
    header("Location: banned.php");
    exit;
}

// Other authentication methods such as user accounts, email verification, or CAPTCHA can be implemented here

// Function to check if the IP address is banned
function is_ip_banned($ip) {
    // Implement your logic to check if the IP address is banned
    // This can be done by querying a database or checking against a list of banned IPs
    // Return true if the IP address is banned, false otherwise
}

Keywords

IP-based bans user restrictions limitations PHP security

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