What are the potential risks of relying solely on IP address verification for user authentication in a PHP application?

Relying solely on IP address verification for user authentication in a PHP application is risky because IP addresses can be easily spoofed or changed, leading to potential unauthorized access. To enhance security, it is recommended to incorporate additional authentication methods such as username/password or two-factor authentication. 

// Sample code snippet implementing username/password authentication in PHP
$username = $_POST['username'];
$password = $_POST['password'];

// Validate username and password against database
if ($username === 'admin' && $password === 'password123') {
    // Authentication successful
    echo 'Welcome, admin!';
} else {
    // Authentication failed
    echo 'Invalid credentials. Please try again.';
}

Keywords

IP address verification user authentication security risks PHP application potential vulnerabilities

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