php function myBasket global link basket goods array_keys basket array

<?php
function myBasket(){
 global $link, $basket;
 $goods = array_keys($basket);
 array_shift($goods);
 $ids = implode(",", $goods);
 $sql = "SELECT id, author, title, pubyear, price FROM catalog WHERE id IN ($ids)";
 if(!$result = mysqli_query($link, $sql)) return false;
 $items = result2Array($result);
 mysqli_free_result($result);
 return $items;
}

function result2Array($data){
 global $basket;
 $arr = array();
 while($row = mysqli_fetch_assoc($data)){
  $row['quantity'] = $basket[$row['id']];
  $arr[] = $row;
 }
 return $arr;
}

if($basket){
 echo 'Вернуться в <a href="catalog.php">каталог</a>';
}else{
 echo 'Корзина пуста! Вернитесь в <a href="catalog.php">каталог</a>';
}
$i = 1;
$sum = 0;
$items = myBasket();
foreach ($items as $item) {
 echo '<tr>
 <td>'.$i++.'</td>
 <td>'.$item['title'].'</td>
 <td>'.$item['author'].'</td>
 <td>'.$item['pubyear'].'</td>
 <td>'.$item['price'].'</td>
 <td>'.$item['quantity'].'</td>
 <td><a href="delete_from_basket.php?id='.$item['id'].'">Удалить</a></td>
 </tr>';
 $sum += $item['price'] * $item['quantity'];
}
?>
<p>Всего товаров в корзине на сумму: <?= $sum; ?> руб.</p>