How can I implement authentication in PHP?

How can I implement authentication in PHP?

You can implement authentication in PHP using sessions, cookies, or JWT. Would you like examples for any specific method?

Yes, please provide an example using sessions.

Sure! First, start a session with session_start();. Then, validate user credentials and store user info in $_SESSION. Here's a basic example:

session_start();
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $username = $_POST['username'];
    $password = $_POST['password'];
    // Validate credentials (this is just a placeholder)
    if ($username == 'admin' && $password == 'password') {
        $_SESSION['user'] = $username;
        echo 'Logged in!';
    } else {
        echo 'Invalid credentials!';
    }
}

What about using JWT for authentication?

For JWT, you can use libraries like Firebase JWT. After validating user credentials, generate a token:

use irebaseirebase-jwtirebase-jwt;
$token = JWT::encode($payload, $secretKey);

Then, send this token to the client for subsequent requests.