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<?php $array = array ( 0 => array ( 'company' => 1, 'product' => 5, ), 1 => array ( 'company' => 2, 'product' => 4, ), 2 => array ( 'company' => 6, 'product' => 5, ), 3 => array ( 'company' => 2, 'product' => 3, ), ); foreach ($array as $set) { if (!isset($result[$set['product']])) { $result[$set['product']] = $set; } else { $result[$set['product']]['company'] .= ",{$set['company']}"; } } var_export(array_values($result));
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 2, Position 2 = 19
Branch analysis from position: 2
2 jumps found. (Code = 78) Position 1 = 3, Position 2 = 19
Branch analysis from position: 3
2 jumps found. (Code = 43) Position 1 = 7, Position 2 = 11
Branch analysis from position: 7
1 jumps found. (Code = 42) Position 1 = 18
Branch analysis from position: 18
1 jumps found. (Code = 42) Position 1 = 2
Branch analysis from position: 2
Branch analysis from position: 11
1 jumps found. (Code = 42) Position 1 = 2
Branch analysis from position: 2
Branch analysis from position: 19
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 19
filename:       /in/X718h
function name:  (null)
number of ops:  27
compiled vars:  !0 = $array, !1 = $set, !2 = $result
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
   26     1      > FE_RESET_R                                       $4      !0, ->19
          2    > > FE_FETCH_R                                               $4, !1, ->19
   27     3    >   FETCH_DIM_R                                      ~5      !1, 'product'
          4        ISSET_ISEMPTY_DIM_OBJ                         0  ~6      !2, ~5
          5        BOOL_NOT                                         ~7      ~6
          6      > JMPZ                                                     ~7, ->11
   28     7    >   FETCH_DIM_R                                      ~8      !1, 'product'
          8        ASSIGN_DIM                                               !2, ~8
          9        OP_DATA                                                  !1
   27    10      > JMP                                                      ->18
   30    11    >   FETCH_DIM_R                                      ~10     !1, 'product'
         12        NOP                                                      
         13        FETCH_DIM_R                                      ~13     !1, 'company'
         14        FAST_CONCAT                                      ~14     '%2C', ~13
         15        FETCH_DIM_RW                                     $11     !2, ~10
         16        ASSIGN_DIM_OP                .=               8          $11, 'company'
         17        OP_DATA                                                  ~14
   26    18    > > JMP                                                      ->2
         19    >   FE_FREE                                                  $4
   33    20        INIT_FCALL                                               'var_export'
         21        INIT_FCALL                                               'array_values'
         22        SEND_VAR                                                 !2
         23        DO_ICALL                                         $15     
         24        SEND_VAR                                                 $15
         25        DO_ICALL                                                 
         26      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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