session

<?php
session_start();
error_reporting(0);

############################ [Start connect] ###########################
    $connect = new mysqli("localhost","root","","tut_php");
        if($connect->connect_error){
            die("Error conect:".$connect->connect_error);
        }
############################ [End connect] #############################


############################ [Start Logout] ###########################################
if($_GET['type'] == 'logout'){
    session_destroy();
    echo'<center><h3 class="ok">Please Wait .. Redirect after 3 sec ..</h3></center>';
    echo'<meta http-equiv="refresh" content="3;url=session.php">';
}
############################ [End Logout] ##############################################


############################ [End Login] ###############################################

if(isset($_POST['login'])){
    $user = $_POST['user'];
    $pass = md5($_POST['pass']);

    if(empty($user) and empty($pass)){
        echo'Please insert all information and try again';
    }else{
        $query_ad = $connect->query("select * from admin where user = '".$user."' and pass = '".$pass."'");
        if(mysqli_num_rows($query_ad) > 0){
            $fetch_l = $query_ad->fetch_object();
            $g_user = $fetch_l->user;
            $g_pass = md5($fetch_l->pass);

            if($user != $g_user and $pass != $g_pass){
                echo'<h2>Sorry the information incorrect .. Please try again</h2>';
            }else{
                $_SESSION['user'] = $user;
                echo'<center><h3 class="ok">Please Wait .. Redirect after 3 sec ..</h3></center>';
                echo'<meta http-equiv="refresh" content="3;url=session.php">';
            }
        }
    }
}
$usern = $_SESSION['user'];
if(empty($usern)){
    echo'<form action="session.php" method="post">
        Username : <input type="text" name="user"><br>
        Password : <input type="password" name="pass"><br>
        <input type="submit" name="login" value="Login" />
        </form>';
}else{
    echo 'welcome : '.$usern;
    echo'<br><a href="?type=logout">Logout</a>';
}

############################ [End Login] ###############################################

?>