Сценарии и сессии задание

<?php
session_start();
 
if ($_GET['destroy'] == true) {
    session_destroy();
    header('Location: /');
}
 
if ($_GET['lot'] == true) {
    $_SESSION['lot'] = $_GET['lot'];
    $_SESSION['price'] = $_GET['price'];
    $_SESSION['name'] = $_GET['name'];
    header('Location: /');
}   
elseif(empty($_SESSION['lot'])) { ?>
    <a href="?lot=true&price=9&name=lot name">создание переменных</a>
<?php }
 
if (isset($_SESSION['price']) and $_SESSION['price'] > 0) { ?>
 
<table border="1" width="100%">
    <tr>
        <td><?php echo $lot = (isset($_SESSION['lot'])) ? 'true' : ''?></td>
        <td><?php echo $_SESSION['price']?></td>
        <td><?php echo $_SESSION['name'] ?></td>
    </tr>
</table>
<?php
$_SESSION['price'] = $_SESSION['price'] - 1;
 }
elseif (isset($_SESSION['price']) and $_SESSION['price'] <= 0) {
    echo 'лот снят';
    session_destroy();
}   
 
if ((isset($_SESSION['lot']) and !empty($_SESSION['lot'])) or (!empty($_SESSION['price']) and $_SESSION['price'] <= 0)): ?>
     <a href="index.php?destroy=true">удалить</a>
 <?php endif?>