Saving session data and post it to database - php

Question

I have a site where you can order some tickets. If someone makes an order, I want the order to be send to the database. Also I want to put the specific cart items in to be send to the database. See the model I use:
ORDERS CART ITEMS
id* id
amount order_id*
product_id
quantity
This is the code I use with the form:
<form action="index.php?page=cart" method="post" class="">
<table class=" table__nav">
<thead>
<tr>
<th class="p p--bold p--th th--ticket">Ticket</th>
<th class="p p--bold p--th th--name">Name</th>
<th class="p p--bold p--th th--quantity">Quantity</th>
<th class="p p--bold p--th th--price">Price per ticket</th>
<th class="p p--bold p--th th--itemtotal">Item Total</th>
</tr>
</thead>
<tbody>
<?php
$total = 0;
foreach($_SESSION['cart'] as $ticket) {
$ticketTotal = $ticket['ticket']['price'] * $ticket['quantity'];
$total += $ticketTotal;
?>
<tr>
<td>
<?php echo $ticket['ticket']['eye_cart']; ?>
</td>
<td>
<p class = "p--bold"><?php echo $ticket['ticket']['name']; ?></p>
</td>
<td>
<input class = "p td--quantity" type="number" name="quantity[<?php echo $ticket['ticket']['id'];?>]" value="<?php echo $ticket['quantity'];?>" class="replace" required />
</td>
<td>
<p>€<?php echo $ticket['ticket']['price'];?>,-</p>
</td>
<td>
<p>€<?php echo $ticketTotal;?>,-</p>
</td>
<td>
<td class="remove-item"><button type="submit" class="btn remove-from-cart" name="remove" value="<?php echo $ticket['ticket']['id'];?>">×</button></td>
</td>
</tr>
</tbody>
<?php } ?>
</table>
<div class="table__wrap">
<button type="submit" id="update-cart" class="btn btn--cart" name="action" value="update">
<img width="14" height="14" src="./assets/img/refresh.png" alt="refresh">
</button>
</img>
<p class="table__order--total"><span class="span--bold span--bold-no">Total:</span></p>
<p class="table__order--number"><span class="span--bold span--bold-no">€ <?php echo $total ?>,-</span></p>
</div>
<div class="table__wrap table__wrap--end">
<a class="p p__li p__li--light" href="index.php?page=register">
<button type = "submit" name ="action" value = "details" class="btn btn--big btn--big-2 btn--dark">your details -> </button></a>
</div>
</form>
When the user presses the button to go to "your details" I want to save an order with the total amount + the cart items with the order_id and quantity.
I'm using the MVC model for this but I can't really figure it out.
This is how my controller looks:
if ($_POST['action'] == 'details') {
$data = array(
'amount' => $total,
);
$insertedOrder = $this->orderDAO->insertOrder($data);
$this->set('insertedOrder', $insertedOrder);
if (empty($insertedOrder)) {
$errors = $this->orderDAO->validate($data);
$this->set('errors', $errors);
}
}
if ($_POST['action'] == 'details') {
$dataB= array(
'order_id' => ?,
'product_id' => $_SESSION['cart']['id']['ticket']['id'],
'quantity' => $_SESSION['cart']['quantity'],
);
$insertedCartItem = $this->orderDAO->insertCartItem($data);
$this->set('insertedCartItem', $insertedCartItem);
if (empty($insertedCartItem)) {
$errors = $this->orderDAO->validateB($dataB);
$this->set('errors', $errors);
}
}
And the next code is my DAO:
public function insertOrder($data){
$errors = $this->validate( $data );
if (empty($errors)) {
$sql = "INSERT INTO `orders` (`amount`) VALUES (:amount)";
$stmt = $this->pdo->prepare($sql);
$stmt->bindValue(':amount', $data['amount']);
if ($stmt->execute()) {
return $this->selectOrderById($this->pdo->lastInsertId());
}
}
return false;
}
public function insertCartItem($dataB){
$errors = $this->validateB($dataB);
if (empty($errors)) {
$sql = "INSERT INTO `cart_items` (`order_id` `product_id`,`quantity`) VALUES (:order_id, :product_id, :quantity)";
$stmt = $this->pdo->prepare($sql);
$stmt->bindValue(':order_id', $dataB['order_id']);
$stmt->bindValue(':product_id', $dataB['product_id']);
$stmt->bindValue(':quantity', $dataB['quantity']);
if ($stmt->execute()) {
return $this->selectCartItemById($this->pdo->lastInsertId());
}
}
return false;
}
The main problem I have is that I don't know how I can send data from $_SESSION variables to the database. I run into problems in the controller. As you can see I'm sending data with the $data and $dataB, but I think I'm going wrong there.