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`index.php`

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<?php
session_start();


if (isset($_GET['logout'])) {
    session_destroy();
    session_start(); 
}


if ($_SERVER['REQUEST_METHOD'] === 'POST' && !empty($_POST['namn'])) {
    $_SESSION['namn'] = $_POST['namn'];
}
?>
<!DOCTYPE html>
<html lang="sv">
<head>
    <meta charset="UTF-8">
    <title>M03u02</title>
    <link rel="stylesheet" href="bulma.css">
</head>
<body>
    <main class="section">
        <div class="container box">
            <h1 class="title">m03u02</h1>
                
        
            <form method="post" class="mb-4">
                <div class="field">
                    <label class="label">Ange ditt namn:</label>
                    <div class="control">
                        <input class="input" type="text" name="namn" placeholder="Skriv ditt namn">
                    </div>
                </div>
                <div class="control">
                    <button class="button is-primary" type="submit">Spara</button>
                </div>
            </form>

            
            <div class="content">
                <?php
                if (isset($_SESSION['namn'])) {
                    echo "<p><strong>Användare:</strong> " . $_SESSION['namn'] . "</p>";
                    echo '<a class="button is-danger" href="?logout=1">Logga ut</a>';
                } else {
                    echo "<p>Det finns ingen användare!</p>";
                }
                ?>
            </div>

            <br>
            <a class="button" href="?">Ladda om sidan</a>
        </div>
    </main>
</body>
</html>