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<?php $ids = [1, 2, 2, 3]; $vals = [10, 20, 30, 50]; foreach ($ids as $index => $id) { $result[$id] = ($result[$id] ?? 0) + $vals[$index]; } var_export($result);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 3, Position 2 = 13
Branch analysis from position: 3
2 jumps found. (Code = 78) Position 1 = 4, Position 2 = 13
Branch analysis from position: 4
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 13
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 13
filename:       /in/EdTDf
function name:  (null)
number of ops:  18
compiled vars:  !0 = $ids, !1 = $vals, !2 = $id, !3 = $index, !4 = $result
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    4     1        ASSIGN                                                   !1, <array>
    6     2      > FE_RESET_R                                       $7      !0, ->13
          3    > > FE_FETCH_R                                       ~8      $7, !2, ->13
          4    >   ASSIGN                                                   !3, ~8
    7     5        FETCH_DIM_IS                                     ~11     !4, !2
          6        COALESCE                                         ~12     ~11
          7        QM_ASSIGN                                        ~12     0
          8        FETCH_DIM_R                                      ~13     !1, !3
          9        ADD                                              ~14     ~12, ~13
         10        ASSIGN_DIM                                               !4, !2
         11        OP_DATA                                                  ~14
    6    12      > JMP                                                      ->3
         13    >   FE_FREE                                                  $7
    9    14        INIT_FCALL                                               'var_export'
         15        SEND_VAR                                                 !4
         16        DO_ICALL                                                 
         17      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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