What potential issues can arise when using IP-based access control in PHP scripts?

One potential issue when using IP-based access control in PHP scripts is that IP addresses can be easily spoofed or changed, allowing unauthorized users to gain access. To mitigate this risk, it is recommended to combine IP-based access control with other authentication methods, such as username and password validation. 

// Example of combining IP-based access control with username and password validation
$allowed_ips = ['192.168.1.1', '10.0.0.1']; // List of allowed IP addresses
$allowed_user = 'admin'; // Username
$allowed_password = 'password123'; // Password

$user_ip = $_SERVER['REMOTE_ADDR']; // Get user's IP address
$username = $_POST['username']; // Get username from form
$password = $_POST['password']; // Get password from form

if (in_array($user_ip, $allowed_ips) && $username === $allowed_user && $password === $allowed_password) {
    // User is authorized, proceed with script execution
    echo 'Access granted!';
} else {
    // User is not authorized, deny access
    echo 'Access denied!';
}

Keywords

IP-based access control PHP scripts security vulnerabilities whitelist blacklist

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