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run code in 200+ php & hhvm versions
<?php $source=json_decode('[{"parentTitle":"Winner 2009","catTitle":"Mas Muster","title":"drm202"},{"parentTitle":"Winner 2009","catTitle":"Mas Muster","title":"drm202"},{"parentTitle":"Winner 2011","catTitle":"Josh Frank","title":"A bird in the cage"},{"parentTitle":"Winner 2011","catTitle":"Josh Frank","title":"cue & repeat"}]'); $result=array(); array_walk($source,function($v,$i)use(&$result){ if(!isset($result[$v->parentTitle])) $result[$v->parentTitle]=array(); if(!isset($result[$v->parentTitle][$v->catTitle])) $result[$v->parentTitle][$v->catTitle]=array(); if(!in_array($v->title,$result[$v->parentTitle][$v->catTitle])) $result[$v->parentTitle][$v->catTitle][]=$v->title; }); print_r($result); // just to debug echo "<ul>"; foreach($result as $key=>$sub){ echo "<li>".htmlentities($key,ENT_COMPAT,"UTF-8"); echo "\n<ul>"; foreach($sub as $k=>$s){ echo "<li>".htmlentities($k,ENT_COMPAT,"UTF-8"); echo "\n<ul>"; foreach($s as $i=>$v){ echo "<li>".htmlentities($v,ENT_COMPAT,"UTF-8")."</li>\n"; } echo "</ul>\n</li>"; } echo "</ul>\n</li>"; } echo "</ul>";
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 16, Position 2 = 55
Branch analysis from position: 16
2 jumps found. (Code = 78) Position 1 = 17, Position 2 = 55
Branch analysis from position: 17
2 jumps found. (Code = 77) Position 1 = 27, Position 2 = 52
Branch analysis from position: 27
2 jumps found. (Code = 78) Position 1 = 28, Position 2 = 52
Branch analysis from position: 28
2 jumps found. (Code = 77) Position 1 = 38, Position 2 = 49
Branch analysis from position: 38
2 jumps found. (Code = 78) Position 1 = 39, Position 2 = 49
Branch analysis from position: 39
1 jumps found. (Code = 42) Position 1 = 38
Branch analysis from position: 38
Branch analysis from position: 49
1 jumps found. (Code = 42) Position 1 = 27
Branch analysis from position: 27
Branch analysis from position: 49
Branch analysis from position: 52
1 jumps found. (Code = 42) Position 1 = 16
Branch analysis from position: 16
Branch analysis from position: 52
Branch analysis from position: 55
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 55
filename:       /in/sQ59p
function name:  (null)
number of ops:  58
compiled vars:  !0 = $source, !1 = $result, !2 = $sub, !3 = $key, !4 = $s, !5 = $k, !6 = $v, !7 = $i
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'json_decode'
         1        SEND_VAL                                                 '%5B%7B%22parentTitle%22%3A%22Winner+2009%22%2C%22catTitle%22%3A%22Mas+Muster%22%2C%22title%22%3A%22drm202%22%7D%2C%7B%22parentTitle%22%3A%22Winner+2009%22%2C%22catTitle%22%3A%22Mas+Muster%22%2C%22title%22%3A%22drm202%22%7D%2C%7B%22parentTitle%22%3A%22Winner+2011%22%2C%22catTitle%22%3A%22Josh+Frank%22%2C%22title%22%3A%22A+bird+in+the+cage%22%7D%2C%7B%22parentTitle%22%3A%22Winner+2011%22%2C%22catTitle%22%3A%22Josh+Frank%22%2C%22title%22%3A%22cue+%26+repeat%22%7D%5D'
         2        DO_ICALL                                         $8      
         3        ASSIGN                                                   !0, $8
   3     4        ASSIGN                                                   !1, <array>
   4     5        INIT_FCALL                                               'array_walk'
         6        SEND_REF                                                 !0
         7        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FsQ59p0x7f16b6bc12ba'
         8        BIND_LEXICAL                                             ~11, !1
   8     9        SEND_VAL                                                 ~11
        10        DO_ICALL                                                 
   9    11        INIT_FCALL                                               'print_r'
        12        SEND_VAR                                                 !1
        13        DO_ICALL                                                 
  10    14        ECHO                                                     '%3Cul%3E'
  11    15      > FE_RESET_R                                       $14     !1, ->55
        16    > > FE_FETCH_R                                       ~15     $14, !2, ->55
        17    >   ASSIGN                                                   !3, ~15
  12    18        INIT_FCALL                                               'htmlentities'
        19        SEND_VAR                                                 !3
        20        SEND_VAL                                                 2
        21        SEND_VAL                                                 'UTF-8'
        22        DO_ICALL                                         $17     
        23        CONCAT                                           ~18     '%3Cli%3E', $17
        24        ECHO                                                     ~18
  13    25        ECHO                                                     '%0A%3Cul%3E'
  14    26      > FE_RESET_R                                       $19     !2, ->52
        27    > > FE_FETCH_R                                       ~20     $19, !4, ->52
        28    >   ASSIGN                                                   !5, ~20
  15    29        INIT_FCALL                                               'htmlentities'
        30        SEND_VAR                                                 !5
        31        SEND_VAL                                                 2
        32        SEND_VAL                                                 'UTF-8'
        33        DO_ICALL                                         $22     
        34        CONCAT                                           ~23     '%3Cli%3E', $22
        35        ECHO                                                     ~23
  16    36        ECHO                                                     '%0A%3Cul%3E'
  17    37      > FE_RESET_R                                       $24     !4, ->49
        38    > > FE_FETCH_R                                       ~25     $24, !6, ->49
        39    >   ASSIGN                                                   !7, ~25
  18    40        INIT_FCALL                                               'htmlentities'
        41        SEND_VAR                                                 !6
        42        SEND_VAL                                                 2
        43        SEND_VAL                                                 'UTF-8'
        44        DO_ICALL                                         $27     
        45        CONCAT                                           ~28     '%3Cli%3E', $27
        46        CONCAT                                           ~29     ~28, '%3C%2Fli%3E%0A'
        47        ECHO                                                     ~29
        48      > JMP                                                      ->38
        49    >   FE_FREE                                                  $24
  20    50        ECHO                                                     '%3C%2Ful%3E%0A%3C%2Fli%3E'
        51      > JMP                                                      ->27
        52    >   FE_FREE                                                  $19
  22    53        ECHO                                                     '%3C%2Ful%3E%0A%3C%2Fli%3E'
        54      > JMP                                                      ->16
        55    >   FE_FREE                                                  $14
  24    56        ECHO                                                     '%3C%2Ful%3E'
        57      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2FsQ59p0x7f16b6bc12ba:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 7, Position 2 = 10
Branch analysis from position: 7
2 jumps found. (Code = 43) Position 1 = 16, Position 2 = 21
Branch analysis from position: 16
2 jumps found. (Code = 43) Position 1 = 32, Position 2 = 39
Branch analysis from position: 32
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 39
Branch analysis from position: 21
Branch analysis from position: 10
filename:       /in/sQ59p
function name:  {closure}
number of ops:  40
compiled vars:  !0 = $v, !1 = $i, !2 = $result
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   4     0  E >   RECV                                             !0      
         1        RECV                                             !1      
         2        BIND_STATIC                                              !2, 'result'
   5     3        FETCH_OBJ_R                                      $3      !0, 'parentTitle'
         4        ISSET_ISEMPTY_DIM_OBJ                       33554432  ~4      !2, $3
         5        BOOL_NOT                                         ~5      ~4
         6      > JMPZ                                                     ~5, ->10
         7    >   FETCH_OBJ_R                                      $6      !0, 'parentTitle'
         8        ASSIGN_DIM                                               !2, $6
         9        OP_DATA                                                  <array>
   6    10    >   FETCH_OBJ_R                                      $8      !0, 'parentTitle'
        11        FETCH_OBJ_R                                      $10     !0, 'catTitle'
        12        FETCH_DIM_IS                                     $9      !2, $8
        13        ISSET_ISEMPTY_DIM_OBJ                       33554432  ~11     $9, $10
        14        BOOL_NOT                                         ~12     ~11
        15      > JMPZ                                                     ~12, ->21
        16    >   FETCH_OBJ_R                                      $13     !0, 'parentTitle'
        17        FETCH_OBJ_R                                      $15     !0, 'catTitle'
        18        FETCH_DIM_W                                      $14     !2, $13
        19        ASSIGN_DIM                                               $14, $15
        20        OP_DATA                                                  <array>
   7    21    >   INIT_FCALL                                               'in_array'
        22        FETCH_OBJ_R                                      $17     !0, 'title'
        23        SEND_VAR                                                 $17
        24        FETCH_OBJ_R                                      $18     !0, 'parentTitle'
        25        FETCH_OBJ_R                                      $20     !0, 'catTitle'
        26        FETCH_DIM_R                                      $19     !2, $18
        27        FETCH_DIM_R                                      $21     $19, $20
        28        SEND_VAR                                                 $21
        29        DO_ICALL                                         $22     
        30        BOOL_NOT                                         ~23     $22
        31      > JMPZ                                                     ~23, ->39
        32    >   FETCH_OBJ_R                                      $24     !0, 'parentTitle'
        33        FETCH_OBJ_R                                      $26     !0, 'catTitle'
        34        FETCH_OBJ_R                                      $29     !0, 'title'
        35        FETCH_DIM_W                                      $25     !2, $24
        36        FETCH_DIM_W                                      $27     $25, $26
        37        ASSIGN_DIM                                               $27
        38        OP_DATA                                                  $29
   8    39    > > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FsQ59p0x7f16b6bc12ba

Generated using Vulcan Logic Dumper, using php 7.3.0