What are the potential security risks of using client-side solutions for user authentication in PHP?

Using client-side solutions for user authentication in PHP poses security risks as client-side code can be easily manipulated by users, allowing them to bypass authentication checks. To mitigate this risk, authentication should be performed on the server-side to ensure that user credentials are securely validated. 

// Server-side authentication example
if ($_POST['username'] === 'admin' && $_POST['password'] === 'password') {
    // Authentication successful
    $_SESSION['authenticated'] = true;
    header('Location: dashboard.php');
    exit;
} else {
    // Authentication failed
    header('Location: login.php?error=1');
    exit;
}

Keywords

client-side solutions user authentication security risks PHP vulnerabilities

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