PHP Array轉換和簡化多維數組

Question

我有這個數組下面，並希望像這樣組織：類別22包含783,784,785。 11類包含783,784,785等。我有點卡... 所以下面是源和下面，這是我想要將數組轉換。

Array 
(
    [783] = Array 
     (
      [categories] = Array 
       (
        [0] = 22 
        [1] = 11 
        [2] = 12 
       ) 

     ) 

    [784] = Array 
     (
      [categories] = Array 
       (
        [0] = 22 
        [1] = 11 
        [2] = 12 
       ) 

     ) 

    [785] = Array 
     (
      [categories] = Array 
       (
        [0] = 22 
        [1] = 11 
        [2] = 12 
       ) 

     ) 

) 

想將數組轉換爲此。

Array 
    (
     [22] = Array 
      (
       [0] => 783 
       [1] => 784 
       [2] => 785 
      ) 

     [11] = Array 
      (
       [0] => 783 
       [1] => 784 
       [2] => 785 
      ) 

     [12] = Array 
      (
       [0] => 783 
       [1] => 784 
       [2] => 785 
      ) 
    ) 

Answer 1

所以只是迭代原始數組並組裝結果;像這樣：

$categories = array(); 

foreach ($data as $itemId => $itemData) { 
     foreach ($itemData['categories'] as $categoryId) { 
       $categories[$categoryId][] = $itemId; 
     } 
}