array_search能否返回多维数组或嵌套数组的内部数组的键？

问：

我正在处理一个购物车项目，并且有一个 $_SESSION['productSummary'] 数组，如下所示。

[productSummary] => Array
        (
            [0] => Array
                (
                    [name] => Individual Coins
                    [code] => 8774
                    [IDs] => Array
                        (
                            [0] => 8774
                            [1] => 8775
                            [2] => 8778
                            [3] => 8765
                        )

                    [pluID] => 6105
                    [qty] => 4
                    [finalPrice] => 0.0000
                    [listPrice] => 0.0000
                    [shipping] => 0.0000
                )

            [1] => Array
                (
                    [name] => Business Package - 5,000
                    [code] => 8770
                    [IDs] => Array
                        (
                            [0] => 8770
                        )

                    [pluID] => 6087
                    [qty] => 1
                    [finalPrice] => 125.0000
                    [listPrice] => 125.0000
                    [shipping] => 0.0000
                )

        )

当用户想要从购物车中删除商品 #8778 时，我需要找到“8778”的索引键的值，以便我可以从 ID 数组中删除该值。

这是我到目前为止的代码片段。我得到了很好的$matchingKey值，但 $matchingKey 2 始终是空的。

// Find the key for the parent array
$matchingKey = array_search(8778, array_column($_SESSION["productSummary"], 'IDs'));

// Find the key for the element in the nested IDs array
$matchingKey2 = array_search(8778, array_column($_SESSION['productSummary'][$matchingKey]['IDs']));

// If it found a match, unset that element
if(!empty($matchingKey2)) {
     unset($_SESSION["productSummary"][$matchingKey]['IDs'][$matchingKey2]);
}

// Reindex the array
$_SESSION["productSummary"][$matchingKey]['IDs'] = array_values($_SESSION["productSummary"][$matchingKey]['IDs']);

我期待

$matchingKey2 = array_search(8778, array_column($_SESSION['productSummary'][$matchingKey]['IDs']));

在此示例中返回值 2，但 if 返回为 NULL

更新：已解决根据给出的答案，我将我的代码更新为此，它现在似乎按预期工作。（或者至少在我再次打破它之前。谢谢大家

// $results is pulled from query of database based on a packageID - Short version is it puts all packaged inventory items in the cart and allows all to be taken out of the cart in as a group.

foreach ($results as $cartItem) {
           
           // set cart time in the database back to NULL so it will appear in the store again
           $query = "hidden";
           dbWriteQuery($query);
               
           // Remove item from SESSION['products']
           $indexA = array_search($cartItem['inventoryID'], array_column($_SESSION["products"], 'code'));
   
           if($indexA !== false) { 
               unset($_SESSION["products"][$indexA]);
           }
           // Reindex the array
           $_SESSION["products"] = array_values($_SESSION["products"]);
   

           // Remove item (or reduce qty) from SESSION['productSummary']   
           foreach ($_SESSION["productSummary"] as $key => $product) {
               $indexB = array_search($cartItem['inventoryID'], $product['IDs']);
               
               //Found a matching element
               if ($indexB !== false) {
                   
                   // if count of $product['IDs'] > 1, reduce the qty and remove the inventoryID from ID's
                   if(count($product['IDs'])>1) {
                       //reduct the qty
                       $_SESSION['productSummary'][$key]['qty'] = $_SESSION['productSummary'][$key]['qty'] - 1;
                       
                       // remove the inventoryID from the IDs array
                       array_splice($_SESSION['productSummary'][$key]['IDs'], $indexB, 1);
                       
                       // set the 'code' value equal to the next element in the IDs array
                       $_SESSION['productSummary'][$key]['code'] = $_SESSION['productSummary'][$key]['IDs'][0];
                       
                   // else unset the whole element from ProductSummary
                   } else {
                       unset($_SESSION["productSummary"][$key]);
                       
                   }
                                       
                   break;
               }
           }
           
           // Reindex the array
           $_SESSION["productSummary"] = array_values($_SESSION["productSummary"]);
   
       }