gistfile1.php

<?php

Database::beginTransaction();

if ($order = Order::create($data)) {
  $items = $cart->getItems();
  $orderLines = array();
  foreach ($items as $item) {
    $data = array(
      'number' => $item->article->number,
      'number_supplier' => $item->article->number_supplier,
      'text' => $item->article->name,
      'quantity_ordered' => ( $item->quantity * $item->article->quantity_multiplier ),
      'price_in' => $item->article->price_in,
      'price_out' => $item->article->price(false, false, false),
      'order_id' => $order->id,
      'supplier_id' => $item->article->supplier_id,
    );
    
    if (!$orderLine = OrderLine::create($data)) {
      Database::rollbackTransaction();
      throw new \Exception('Could not create order line');
    }
    
    $orderLines[$orderLine->id] = $orderLine;
  }
} else {
  Database::rollbackTransaction();
  throw new \Exception('Could not create order');
}

if (Database::commitTransaction()) {
  $cart->clear();
}

gistfile2.txt

<?php