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<?php $info = [ ['car' => 'Audi', 'previous_car' => 'BMW'], ['car' => 'Audi', 'previous_car' => 'Seat'], ['car' => 'Audi', 'previous_car' => 'BMW'], ['car' => 'BMW', 'previous_car' => 'BMW'], ['car' => 'Ford', 'previous_car' => 'Seat'], ]; $result = []; foreach ($info as $row) { foreach ($row as $k => $v) { $result[$k][$v] = ($result[$k][$v] ?? 0) + 1; } } var_export($result);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 3, Position 2 = 18
Branch analysis from position: 3
2 jumps found. (Code = 78) Position 1 = 4, Position 2 = 18
Branch analysis from position: 4
2 jumps found. (Code = 77) Position 1 = 5, Position 2 = 16
Branch analysis from position: 5
2 jumps found. (Code = 78) Position 1 = 6, Position 2 = 16
Branch analysis from position: 6
1 jumps found. (Code = 42) Position 1 = 5
Branch analysis from position: 5
Branch analysis from position: 16
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 16
Branch analysis from position: 18
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 18
filename:       /in/GQHTE
function name:  (null)
number of ops:  23
compiled vars:  !0 = $info, !1 = $result, !2 = $row, !3 = $v, !4 = $k
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
   11     1        ASSIGN                                                   !1, <array>
   12     2      > FE_RESET_R                                       $7      !0, ->18
          3    > > FE_FETCH_R                                               $7, !2, ->18
   13     4    > > FE_RESET_R                                       $8      !2, ->16
          5    > > FE_FETCH_R                                       ~9      $8, !3, ->16
          6    >   ASSIGN                                                   !4, ~9
   14     7        FETCH_DIM_IS                                     ~13     !1, !4
          8        FETCH_DIM_IS                                     ~14     ~13, !3
          9        COALESCE                                         ~15     ~14
         10        QM_ASSIGN                                        ~15     0
         11        ADD                                              ~16     ~15, 1
         12        FETCH_DIM_W                                      $11     !1, !4
         13        ASSIGN_DIM                                               $11, !3
         14        OP_DATA                                                  ~16
   13    15      > JMP                                                      ->5
         16    >   FE_FREE                                                  $8
   12    17      > JMP                                                      ->3
         18    >   FE_FREE                                                  $7
   17    19        INIT_FCALL                                               'var_export'
         20        SEND_VAR                                                 !1
         21        DO_ICALL                                                 
         22      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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