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`m03u02.php`

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<?php 
session_start();

if(isset($_GET['action'])){
    session_unset();
    session_destroy();
}
?>
<!DOCTYPE html>
<html lang="sv">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>m03u02</title>
    <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,300italic,700,700italic">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/milligram/1.4.1/milligram.css">
</head>
<body>
    <div class="container">
        <?php
        echo "<p>Sessionen innehåller: ";
        if(isset($_POST['name'])){
            $_SESSION['name'] = $_POST['name'];
            echo $_SESSION['name'];
        }
        else if(isset($_SESSION['name'])){
            echo $_SESSION['name'];
        }
        else{
            echo "Inget lagrat anmvändarnamn";
        }
        echo "</p>";
        ?>
        <form action="m03u02.php" method="Post">
            <label>Namn:</label><input type="text" name="name" required placeholder="Ange namn">
            <input type='submit' value='Lagra användarnamn' />
        </form>
        <a href="?action=kill_session">Döda sessionen</a><br />
        <a href="?">Ladda om sidan</a>
    </div>
</body>
</html>