if (count($formError) == 0 && isset($_POST['submitConnect'])) {
    $connectingUser->mail = $mail;
    $existingMail = $connectingUser->existMailConnexion();
    if ($existingMail && password_verify($password, $existingMail->password)) {
        $_SESSION['user'] = $existingMail;
        ?>
    <script>window.location = "http://clairiere/index.php?page=accueil";</script>
    <?php
    }
}