DB structures

2. Check login

Add several users

So maybe we should add some more users. The easiest way to do this is to use an array.


<?php
session_start();
$users = [
    ['stefan','password'],
    ['admin','admin'],
    ['user','user']
];
$found = false;
if(isset($_POST['loginname']) && isset($_POST['password'])) {
    $loginname = $_POST['loginname'];
    $password = $_POST['password'];

    foreach ($users as $user) {
        if ($loginname == $user[0] && $password == $user[1]) {
            $found = true;
            $_SESSION['loggedin'] = true;
            $_SESSION['username'] = $loginname;
            break;
        }
    }
    if ($found) {
        echo "Login successful! Welcome, " . htmlspecialchars($loginname) . "!";
    } else {
        echo "Please enter both username and password.";
    }
}
if(!$found){
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Webtastic</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <form action="index.php" method="post">
        <label>Username: </label><input type="text" name="loginname" id="loginname" />
        <br/>
        <label>Password: </label><input type="password" name="password" id="password" />
        <br/>
        <button>Login please!</button>
    </form>
</body>
</html>

<?php
}

Sessions

I have also added a session.

presentation.php


<?php
session_start();
if (!isset($_SESSION['loggedin'])) {
    header("Location: login.php");
    exit;
}
?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
        <h1>Webtastic</h1>
        <h2>Presentation</h2>
        <p>Welcome <?php echo $_SESSION['username'];?> to the Webtastic presentation page!</p>    
</body>
</html>