Two arrays are added, one array is written to another

2 arrays are added, one array is written to another
Known quantity Group A and array B:

Array A:
Array (
  
  Array (
    ' Cust_no ' = ' 310f6 1va5a ',
    ' Lotno ' = ' 2X15 ',
    ' Part_count ' = ' 0 ',
  ),
  
  Array (
    ' Cust_no ' = ' 310f6 1va5a ',
    ' Lotno ' = ' 2z25 ',
    ' Part_count ' = ' 5 ',
  ),
)

Array B:

Array (
  
  Array (
    ' Cust_no ' = ' 310f6 1va5a ',
    ' Lotno ' = ' 2z15 ',
    ' Part_count ' = ' 100 ',
  ),
  
  Array (
    ' Cust_no ' = ' 310f6 1va5a ',
    ' Lotno ' = ' 3115 ',
    ' Part_count ' = ' 28 ',
  ),
)

The result of array B is added to the array a, and the corresponding part_count of Cust_no,lotno is accumulated. Turns out to be such a result:

Array (
  
  Array (
    ' Cust_no ' = ' 310f6 1va5a ',
    ' Lotno ' = ' 2X15 ',
    ' Part_count ' = ' 0 ',
  ),
  
  Array (
    ' Cust_no ' = ' 310f6 1va5a ',
    ' Lotno ' = ' 2z15 ',
    ' Part_count ' = ' 105 ',
  ),
  
  Array (
    ' Cust_no ' = ' 310f6 1va5a ',
    ' Lotno ' = ' 3115 ',
    ' Part_count ' = ' 28 ',
  ),
)

How do you do that? What array functions do I need to use? Thank you!

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------Solution--------------------

 $t =array (); 
 foreach (Array_merge ($a, $b) as $v) {
 if (!isset ($t [$v [' Cust_no ']. _ '. $v [' Lotno ']]) {
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