How can a PHP beginner differentiate between basic and advanced PHP concepts when facing a login problem?

Issue: When facing a login problem in PHP, a beginner can differentiate between basic and advanced concepts by understanding that basic concepts involve simple user authentication using sessions and form handling, while advanced concepts may involve implementing secure password hashing, CSRF protection, and multi-factor authentication. Code snippet for basic login functionality: 

<?php
session_start();

if($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = "admin";
    $password = "password";

    if($_POST["username"] == $username && $_POST["password"] == $password) {
        $_SESSION["loggedin"] = true;
        header("Location: dashboard.php");
        exit();
    } else {
        echo "Invalid username or password";
    }
}
?>

<form method="post">
    <input type="text" name="username" placeholder="Username" required><br>
    <input type="password" name="password" placeholder="Password" required><br>
    <button type="submit">Login</button>
</form>
```

Code snippet for advanced login functionality with secure password hashing:
```php
<?php
session_start();

if($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = "admin";
    $hashed_password = password_hash("password", PASSWORD_DEFAULT);

    if($_POST["username"] == $username && password_verify($_POST["password"], $hashed_password)) {
        $_SESSION["loggedin"] = true;
        header("Location: dashboard.php");
        exit();
    } else {
        echo "Invalid username or password";
    }
}
?>

<form method="post">
    <input type="text" name="username" placeholder="Username" required><br>
    <input type="password" name="password" placeholder="Password" required><br>
    <button type="submit">Login</button>
</form>

Keywords

PHP beginner advanced concepts login differentiation

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