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<?php $tree = array( 1 => array( 'parent_id' => null, 'name' => 'root', 'depth' => 0, ), 11 => array( 'parent_id' => 1, 'name' => 'a', 'depth' => 1, ), 12 => array( 'parent_id' => 1, 'name' => 'b', 'depth' => 1, ), 111 => array( 'parent_id' => 11, 'name' => 'aa', 'depth' => 2, ), 2 => array( 'parent_id' => null, 'name' => 'other root', 'depth' => 0, ) ); foreach ($tree as $key => &$sub) { if (isset($sub['parent_id'])) { $tree[$sub['parent_id']]['children'][$key] = &$sub; } } unset($sub); // unset the reference to make sure to not overwrite it later... // now remove the entries with parents foreach ($tree as $key => $sub) { if (isset($sub['parent_id'])) unset($tree[$key]); } var_dump($tree);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 125) Position 1 = 2, Position 2 = 12
Branch analysis from position: 2
2 jumps found. (Code = 126) Position 1 = 3, Position 2 = 12
Branch analysis from position: 3
2 jumps found. (Code = 43) Position 1 = 6, Position 2 = 11
Branch analysis from position: 6
1 jumps found. (Code = 42) Position 1 = 2
Branch analysis from position: 2
Branch analysis from position: 11
Branch analysis from position: 12
2 jumps found. (Code = 77) Position 1 = 15, Position 2 = 21
Branch analysis from position: 15
2 jumps found. (Code = 78) Position 1 = 16, Position 2 = 21
Branch analysis from position: 16
2 jumps found. (Code = 43) Position 1 = 19, Position 2 = 20
Branch analysis from position: 19
1 jumps found. (Code = 42) Position 1 = 15
Branch analysis from position: 15
Branch analysis from position: 20
Branch analysis from position: 21
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 21
Branch analysis from position: 12
filename:       /in/1brJs
function name:  (null)
number of ops:  26
compiled vars:  !0 = $tree, !1 = $sub, !2 = $key
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
   31     1      > FE_RESET_RW                                      $4      !0, ->12
          2    > > FE_FETCH_RW                                      ~5      $4, !1, ->12
          3    >   ASSIGN                                                   !2, ~5
   32     4        ISSET_ISEMPTY_DIM_OBJ                         0          !1, 'parent_id'
          5      > JMPZ                                                     ~7, ->11
   33     6    >   FETCH_DIM_R                                      ~8      !1, 'parent_id'
          7        FETCH_DIM_W                                      $9      !0, ~8
          8        FETCH_DIM_W                                      $10     $9, 'children'
          9        FETCH_DIM_W                                      $11     $10, !2
         10        ASSIGN_REF                                               $11, !1
   31    11    > > JMP                                                      ->2
         12    >   FE_FREE                                                  $4
   36    13        UNSET_CV                                                 !1
   39    14      > FE_RESET_R                                       $13     !0, ->21
         15    > > FE_FETCH_R                                       ~14     $13, !1, ->21
         16    >   ASSIGN                                                   !2, ~14
   40    17        ISSET_ISEMPTY_DIM_OBJ                         0          !1, 'parent_id'
         18      > JMPZ                                                     ~16, ->20
   41    19    >   UNSET_DIM                                                !0, !2
   39    20    > > JMP                                                      ->15
         21    >   FE_FREE                                                  $13
   43    22        INIT_FCALL                                               'var_dump'
         23        SEND_VAR                                                 !0
         24        DO_ICALL                                                 
         25      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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