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<?php $array = [ ['_id' => '5f76b1788ee23077dccd1a2c', 'product' => ['_id'=>'5d0391a4a72ffe76b8fcc610'], 'count'=> 1], ['_id' => '5f76b6288ee2300700cd1a3a', 'product' => ['_id'=>'5d0391b6a72ffe76b8fcc611'], 'count'=> 1], ['_id' => '5f76d2488ee23083d3cd1a4a', 'product' => ['_id'=>'5d0391b6a72ffe76b8fcc611'], 'count'=> 1] ]; $productCounts = []; foreach ($array as $item) { $productId = $item['product']['_id']; $productCounts[$productId] = ($productCounts[$productId] ?? 0) + $item['count']; } var_export($productCounts);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 3, Position 2 = 15
Branch analysis from position: 3
2 jumps found. (Code = 78) Position 1 = 4, Position 2 = 15
Branch analysis from position: 4
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 15
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 15
filename:       /in/b3KAi
function name:  (null)
number of ops:  20
compiled vars:  !0 = $array, !1 = $productCounts, !2 = $item, !3 = $productId
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    9     1        ASSIGN                                                   !1, <array>
   10     2      > FE_RESET_R                                       $6      !0, ->15
          3    > > FE_FETCH_R                                               $6, !2, ->15
   11     4    >   FETCH_DIM_R                                      ~7      !2, 'product'
          5        FETCH_DIM_R                                      ~8      ~7, '_id'
          6        ASSIGN                                                   !3, ~8
   12     7        FETCH_DIM_IS                                     ~11     !1, !3
          8        COALESCE                                         ~12     ~11
          9        QM_ASSIGN                                        ~12     0
         10        FETCH_DIM_R                                      ~13     !2, 'count'
         11        ADD                                              ~14     ~12, ~13
         12        ASSIGN_DIM                                               !1, !3
         13        OP_DATA                                                  ~14
   10    14      > JMP                                                      ->3
         15    >   FE_FREE                                                  $6
   15    16        INIT_FCALL                                               'var_export'
         17        SEND_VAR                                                 !1
         18        DO_ICALL                                                 
         19      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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