$pdo = Connection:: getPDO();
$user = new User();
$userManager = new UserManager($pdo);
$errors = array();


if (!empty($_POST)) {
    $user = $userManager->findByUsernameAndPassword($_POST['username'], $_POST['password'] );
    if (!empty($user)) {
        $success = true;
    dd($success);
        $_SESSION['auth'] = $user;
        header('Location: ' . $router->url('blog'));
        exit();

    } else {
        $errors ['username'] =  'Merci de rentrer un mot de passe correct!';
    }
}
require_once('../views/auth/login_member.php');

<?php  if (!empty($uccess)) :?> 
<div class="alert alert-info alert-dismissible text-center" style="width:380px" role="alert">
    <button type="button" class="close" data-dismiss="alert" aria-label="Close">
        <span aria-hidden="true">&times;</span></button>
    <p> Bienvenue - Vous etes connectés  </p>  
</div>

<?php endif ?>

<div class="container">
    <div class="d-flex justify-content-center mb-5">
        <div class="row" id="login">
            <div class="col-12 text-left">
                <form  action ="<?= $router->url('login_member') ?>" method="POST" name="login_member" >
                    <h3 class="box-title text-center mt-3"> MEMBRES : Connectez-vous ici</h3><br>
                    <label for="Pseudo"> Pseudo</label>
                    <input type="text"  name="username" class="form-control my-3"  />
                    <label for="mot de passe">Mot de Passe</label>
                    <input type="password" name="password" class="form-control my-3" />
                        <div class="d-flex justify-content-center"><br>
                        <button type="submit" name="envoyer" class="btn btn-danger mt-5 ">LOGIN ->
                    <svg xmlns="http://www.w3.org/2000/svg" width="30" height="30" fill="currentColor"
                        class="bi bi-emoji-smile" viewBox="0 0 16 16">
                        <path d="M8 15A7 7 0 1 1 8 1a7 7 0 0 1 0 14zm0 1A8 8 0 1 0 8 0a8 8 0 0 0 0 16z" />
                        <path d="M4.285 9.567a.5.5 0 0 1 .683.183A3.498 3.498 0 0 0 8 11.5a3.498 3.498 0 0 0 3.032-1.75.5.5 0 1 1
                                                .866.5A4.498 4.498 0 0 1 8 12.5a4.498 4.498 0 0 1-3.898-2.25.5.5 0 0 1 .183-.683zM7 6.5C7 7.328 6.552 8 6 8s-1-.672-1-1.5S5.448 5 6 5s1 .672 1 1.5zm4 0c0
                                                .828-.448 1.5-1 1.5s-1-.672-1-1.5S9.448 5 10 5s1 .672 1 1.5z" />
                        </svg>
                        </div>
                </form>
            </div>
        </div>

<?php
session_start();

use App\Model\User;
use App\Connection;
use App\Model\UserManager;

$pdo = Connection:: getPDO();
$user = new User();
$userManager = new UserManager($pdo);
$errors = array();

if (!empty($_POST)) {
    $user = $userManager->findByUsernameAndPassword($_POST['username'], $_POST['password'] );
    if (!empty($user)) {
        $success = true;
        $_SESSION['auth'] = $user;
        header('Location: ' . $router->url('blog'));
        exit();
    } else {
        $errors ['username'] =  'Merci de rentrer un mot de passe correct!';
    }
}
require_once('../views/auth/login_member.php');

<?php if(!empty($_POST ['envoyer'])) {
}
if (!empty($success)) : ?> 
<div class="alert alert-info alert-dismissible text-center" style="width:380px" role="alert">
    <button type="button" class="close" data-dismiss="alert" aria-label="Close">
        <span aria-hidden="true">&times;</span></button>
    <p> Bienvenue - Vous etes connectés  </p>  
</div>

<?php endif ?>

if( empty($_POST)) {
    echo "1. Le formulaire n'a jamais été soumis"
}
else if( !empty($_POST) && empty($errors)) {
    echo "2. Le formulaire a été soumis et il n'y a pas d'erreur"
}
else {
    echo "3. Le formulaire a été soumis et il y a des erreurs"
}

<?php if (isset($_POST['envoyer'])) {
}
if (!empty($errors)): ?>{
<div class="alert alert-info alert-dismissible" style="width: 700px;" role="alert">
    <button type="button" class="close" data-dismiss="alert" aria-label="Close">
        <span aria-hidden="true">&times;</span></button>
    <p> les champs ne sont pas conforment</p>
    <ul>
}
        <?php foreach ($errors as $error): ?>
        <li><?= $error; ?> </li>
        <?php endforeach; ?>
    </ul>
</div>

<?php  endif;?>
}

//déclarer $errors
$errors=[contenu du tableau];

//traitement du form:
si aucune erreur: vidage du tableau $errors


?>
- code alert avec le if empty

- code formulaire...

<div class="container">
    <div class="d-flex justify-content-center">
        <div class="row" id="form_insc">
            <div class="col-12 text-left">
                <form  action ="<?= $router->url('login_register') ?>" method="POST" name="login_register">
                    <h3 class="box-title text-center"> INSCRIVEZ - VOUS</h3><br>
                    <label for=""> Pseudo</label>
                    <input type="text"  name="username" class="form-control "  />
                    <label for="">Mot de Passe</label>
                    <input type="password" name="password" class="form-control" />
                    <label for="">Confirmez votre MP</label>
                    <input type="password" name="password_confirm" class="form-control"  /><br>
                        <div class="d-flex justify-content-center">
                        <button type="submit" name="envoyer" class="btn btn-danger mb-2">S'INSCRIRE</button>
                        </div>
                </form>
            </div>
        </div>
    </div>
</div>

<?php if (empty($errors)) : ?>

<div class="alert alert-info alert-dismissible text-center" style="width:380px" role="alert">
    <button type="button" class="close" data-dismiss="alert" aria-label="Close">
        <span aria-hidden="true">&times;</span></button>
    <p> Vous etes connectés  </p>  
</div>