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<?php $array = [ [ 'id' => 1, 'parentId' => "" ], [ 'id' => 2, 'parentId' => 1 ], [ 'id' => 3, 'parentId' => 2 ] ]; $entriesById = array_column($array, null, 'id'); $entriesWithAncestors = array_reduce( $entriesById, static function (array $result, array $entry) use ($entriesById): array { $result[$entry['id']] = $entry + ['ancestors' => []]; $parentId = $entry['parentId']; while (isset($result[$parentId])) { $result[$entry['id']]['ancestors'][] = $result[$parentId]; $parentId = $entriesById[$parentId]['parentId'] ?? null; } return $result; }, [] ); print_r($entriesWithAncestors);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/L4e6P
function name:  (null)
number of ops:  19
compiled vars:  !0 = $array, !1 = $entriesById, !2 = $entriesWithAncestors
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
   18     1        INIT_FCALL                                               'array_column'
          2        SEND_VAR                                                 !0
          3        SEND_VAL                                                 null
          4        SEND_VAL                                                 'id'
          5        DO_ICALL                                         $4      
          6        ASSIGN                                                   !1, $4
   20     7        INIT_FCALL                                               'array_reduce'
   21     8        SEND_VAR                                                 !1
   23     9        DECLARE_LAMBDA_FUNCTION                          ~6      [0]
         10        BIND_LEXICAL                                             ~6, !1
   31    11        SEND_VAL                                                 ~6
         12        SEND_VAL                                                 <array>
   20    13        DO_ICALL                                         $7      
         14        ASSIGN                                                   !2, $7
   34    15        INIT_FCALL                                               'print_r'
         16        SEND_VAR                                                 !2
         17        DO_ICALL                                                 
         18      > RETURN                                                   1


Dynamic Functions:
Dynamic Function 0
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 21
Branch analysis from position: 21
2 jumps found. (Code = 44) Position 1 = 23, Position 2 = 10
Branch analysis from position: 23
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 10
2 jumps found. (Code = 44) Position 1 = 23, Position 2 = 10
Branch analysis from position: 23
Branch analysis from position: 10
filename:       /in/L4e6P
function name:  {closure}
number of ops:  27
compiled vars:  !0 = $result, !1 = $entry, !2 = $entriesById, !3 = $parentId
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   23     0  E >   RECV                                             !0      
          1        RECV                                             !1      
          2        BIND_STATIC                                              !2
   24     3        FETCH_DIM_R                                      ~4      !1, 'id'
          4        ADD                                              ~6      !1, <array>
          5        ASSIGN_DIM                                               !0, ~4
          6        OP_DATA                                                  ~6
   25     7        FETCH_DIM_R                                      ~7      !1, 'parentId'
          8        ASSIGN                                                   !3, ~7
   26     9      > JMP                                                      ->21
   27    10    >   FETCH_DIM_R                                      ~9      !1, 'id'
         11        FETCH_DIM_R                                      ~13     !0, !3
         12        FETCH_DIM_W                                      $10     !0, ~9
         13        FETCH_DIM_W                                      $11     $10, 'ancestors'
         14        ASSIGN_DIM                                               $11
         15        OP_DATA                                                  ~13
   28    16        FETCH_DIM_IS                                     ~14     !2, !3
         17        FETCH_DIM_IS                                     ~15     ~14, 'parentId'
         18        COALESCE                                         ~16     ~15
         19        QM_ASSIGN                                        ~16     null
         20        ASSIGN                                                   !3, ~16
   26    21    >   ISSET_ISEMPTY_DIM_OBJ                         0          !0, !3
         22      > JMPNZ                                                    ~18, ->10
   30    23    >   VERIFY_RETURN_TYPE                                       !0
         24      > RETURN                                                   !0
   31    25*       VERIFY_RETURN_TYPE                                       
         26*     > RETURN                                                   null

End of Dynamic Function 0

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