connexion.php

<?php
include "./config/database.php";
session_start();
if (!isset($_SESSION['authent'])) {
    $_SESSION['authent'] = 0;
}

if (isset($_SESSION['authent'])) :
    if (isset($_POST['uname'], $_POST['psw'])) :
        $peusdo = htmlspecialchars($_POST['uname']);
        $password = htmlspecialchars($_POST['psw']);
        $res=mysqli_query($link,'SELECT * from users');
        while ($row=mysqli_fetch_assoc($res)) :
            if ($row['mail'] == $peusdo && $row['mdp'] == $password) :
                $_SESSION['authent'] = 1;
                $_SESSION['pseudo'] = $row['mail'];
                $_SESSION['name'] = $row['prenom'];
                $_SESSION['id']=$row['id_user']
                ?>
                <div class="row">
                    <div class="col-sm-4 ml-auto">
                        <div class="alert alert-success alert-dismissible fadeIn animated alert-co">
                            <a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a>
                            Bonjour <?=$_SESSION['name']?>, vous êtes connectés
                        </div>
                    </div>
                </div>
        <?php endif;
        endwhile;
        if ($_SESSION['authent'] == 0) : ?>
            <div class="row">
                <div class="col-sm-4 ml-auto">
                    <div class="alert alert-danger alert-dismissible fadeIn animated alert-co">
                        <a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a>
                        Identifiant ou mot de passe incorrects, réessaie 😉
                    </div>
                </div>
            </div>
        <?php endif;
    endif;
endif;
?>