问当用户登录时显示“注销”按钮，当用户未使用PHP/MySQL时显示“连接”按钮

EN

<?php if (isset($_SESSION['user']) && ($_SESSION['user'] == false)): ?>
    <p>Hello </p>
    <a href="logout.php">Logout</a>
<?php else: ?>
    <a href="register.php">Sign up</a>
    <a href="userconnect.php">Connect</a>
<?php endif; ?>

<div class="user-connect">
  <?php if (isset($message)) { echo $message; } ?>
    <form action="userconnect.php" method="post">
        <ul>
            <li>
                <label for="email"></label>
                <input type="text" id='email' name='email'>
            </li>
            <li>
                <label for="password"></label>
                <input type="password" id='password' name='password'>
            </li>
            <li>
                <input type="submit" name="enter">
            </li>
        </ul>
    </form>
</div>

<?php

session_start();

if(isset($_POST["enter"]) && !empty($_POST["enter"])) {
    if(!empty($_POST['email']) && !empty($_POST['password'])) 
    {
        $email = htmlspecialchars($_POST['email']);
        $password = htmlspecialchars(md5(md5($_POST['password'])));

        include ("connection.php");
        $query = $db->prepare('SELECT ID, email, password, firstName FROM user WHERE email = ?');
        $query->execute([$_POST['email']]);
        $user = $query->fetch();  

        if ($user) {
            if($_POST['password'] == $user['password'] && $_POST['email'] == $user['email'])
            {
                $_SESSION['user'] = [
                    'email' => $user['email'],
                    'id' => $user['ID'] 
                ];
            }
            $message = "Vous etes connectez!";
        } else {
            $message = "Invalide email ou mot de passe!";
        }
    } else {
        $message = "Champs obligatoire a saisir";
    }
}

$template = 'userconnect';
include 'layout.phtml';

<?php var_dump(isset($_SESSION['user'])); ?>