在PHP中合并两个关联数组

Question

I have two arrays in PHP that I want to merge. An example of the first array, which is a list of Department and Classes, along with Class totals:

vdump($cl_subtotal);

array(2) {
 'None' → array(1) {
 'None' → float 132.88
}

'instore bakery' → array(10) {
  'pies' → float 70.94
  'cakes' → float 146.71
  'miscellaneous' → float 25.57
  'cookies' → float 52.38
  'brownies' → float 33.96
  'rolls' → float 143.02
  'danish' → float 90.42
  'bagels & pretzels' → float 85.68
  'breads' → float 55.73
  'dessert case' → float 81.83
 }
}

The second array is the Class detail records, and I want them to appear under each Class in the first array. There's a catch. In this second array, if there is no Department or Class, the array key is blank (''). The Department/Class will always both be blank, or they will both contain a string (so there will never be a case where Department is blank, but Class is not blank). These records with blank Department/Class in the second array should be associated with the record in the first array where Department = "None" and Class = "None".

This is an example of the second array:

 vdump($groups);

 array(2) {
 'instore bakery' → array(10) {
   'pies' → array(2) {
     [0] => array(12) {
    'UPC' → str•13 '0004712503209'
    'Department_Desc' → str•14 'instore bakery'
    'Class_Desc' → str•4 'pies'
    'store' → str•2 '11'
    'supplier_number' → str•4 '6303'
    'invoice_number' → str•11 'DI613728199'
    'seq' → str•1 '1'
    'item_id' → str•14 '00047125032097'
    'item_description' → str•9 'MARIONBRY'
    'dept_number' → str•2 '17'
    'final_qty' → str•4 '5.00'
    'final_cost' → str•5 '37.65'
  }

and here's an example record with blank Department/Class:

     [""] => array(1) {
       [""] => array(4) {
        [0] => array(10) {
        'store' → str•2 '11'
        'supplier_number' → str•4 '6303'
        'invoice_number' → str•11 'DI613728199'
        'seq' → str•1 '8'
        'item_id' → str•14 '00047125032332'
        'UPC' → str•13 '0004712503233'
        'item_description' → str•9 'NOT FOUND'
        'dept_number' → str•1 '0'
       'final_qty' → str•4 '2.00'
        'final_cost' → str•5 '20.96'
     }

Answer 1

Here's how I resolved this: I first replaced the empty keys in the second array ($groups). I then did:

            foreach($cl_subtotal as $grname => &$itemlist ){
            foreach($itemlist as $ilk => &$ilv){
                $ilv = array(
                    'value' => $ilv,
                );
                foreach($groups[$grname][$ilk] as $k => $v) {
                    $ilv[$k] = $v;
                }
            }
        }

to merge the array with details into the summary array.