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<?php class CategoryTree { protected $roots = []; public function addCategory($category, $parent) { if ($this->categoryExists($this->roots, $category)) { throw new InvalidArgumentException("Category: '$category' already exists."); } if ($parent === null) { $this->roots[$category] = []; return; } $node = &$this->findNode($parent, $this->roots); if(!isset($node)) { throw new InvalidArgumentException("Parent node: '$parent' not found."); } $node[$category] = []; } public function getChildren($parent) { $node = $this->findNode($parent, $this->roots); if(!isset($node)) { throw new InvalidArgumentException("Parent node: '$parent' not found."); } return array_keys($node); } protected function &findNode($node, &$root) { if (in_array($node, array_keys($root))) { return $root[$node]; } foreach ($root as $n) { return $this->findNode($node, $n); } } protected function categoryExists($nodes, $category) { $exists = false; foreach($nodes as $key => $node) { if ($key === $category) { return true; } $exists = $this->categoryExists($node, $category); } return $exists; } } // For testing purposes (do not submit uncommented): $c = new CategoryTree; $c->addCategory('A', null); $c->addCategory('B', 'A'); $c->addCategory('B', null); $c->addCategory('C', 'A'); echo implode(',', $c->getChildren('A'));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/24HNi
function name:  (null)
number of ops:  28
compiled vars:  !0 = $c
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   55     0  E >   NEW                                              $1      'CategoryTree'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $1
   56     3        INIT_METHOD_CALL                                         !0, 'addCategory'
          4        SEND_VAL_EX                                              'A'
          5        SEND_VAL_EX                                              null
          6        DO_FCALL                                      0          
   57     7        INIT_METHOD_CALL                                         !0, 'addCategory'
          8        SEND_VAL_EX                                              'B'
          9        SEND_VAL_EX                                              'A'
         10        DO_FCALL                                      0          
   58    11        INIT_METHOD_CALL                                         !0, 'addCategory'
         12        SEND_VAL_EX                                              'B'
         13        SEND_VAL_EX                                              null
         14        DO_FCALL                                      0          
   59    15        INIT_METHOD_CALL                                         !0, 'addCategory'
         16        SEND_VAL_EX                                              'C'
         17        SEND_VAL_EX                                              'A'
         18        DO_FCALL                                      0          
   60    19        INIT_FCALL                                               'implode'
         20        SEND_VAL                                                 '%2C'
         21        INIT_METHOD_CALL                                         !0, 'getChildren'
         22        SEND_VAL_EX                                              'A'
         23        DO_FCALL                                      0  $8      
         24        SEND_VAR                                                 $8
         25        DO_ICALL                                         $9      
         26        ECHO                                                     $9
         27      > RETURN                                                   1

Class CategoryTree:
Function addcategory:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 9, Position 2 = 16
Branch analysis from position: 9
1 jumps found. (Code = 108) Position 1 = -2
Branch analysis from position: 16
2 jumps found. (Code = 43) Position 1 = 18, Position 2 = 22
Branch analysis from position: 18
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 22
2 jumps found. (Code = 43) Position 1 = 32, Position 2 = 39
Branch analysis from position: 32
1 jumps found. (Code = 108) Position 1 = -2
Branch analysis from position: 39
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/24HNi
function name:  addCategory
number of ops:  42
compiled vars:  !0 = $category, !1 = $parent, !2 = $node
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    6     0  E >   RECV                                             !0      
          1        RECV                                             !1      
    8     2        INIT_METHOD_CALL                                         'categoryExists'
          3        CHECK_FUNC_ARG                                           
          4        FETCH_OBJ_FUNC_ARG                               $3      'roots'
          5        SEND_FUNC_ARG                                            $3
          6        SEND_VAR_EX                                              !0
          7        DO_FCALL                                      0  $4      
          8      > JMPZ                                                     $4, ->16
    9     9    >   NEW                                              $5      'InvalidArgumentException'
         10        ROPE_INIT                                     3  ~7      'Category%3A+%27'
         11        ROPE_ADD                                      1  ~7      ~7, !0
         12        ROPE_END                                      2  ~6      ~7, '%27+already+exists.'
         13        SEND_VAL_EX                                              ~6
         14        DO_FCALL                                      0          
         15      > THROW                                         0          $5
   12    16    >   TYPE_CHECK                                    2          !1
         17      > JMPZ                                                     ~10, ->22
   13    18    >   FETCH_OBJ_W                                      $11     'roots'
         19        ASSIGN_DIM                                               $11, !0
         20        OP_DATA                                                  <array>
   14    21      > RETURN                                                   null
   17    22    >   INIT_METHOD_CALL                                         'findNode'
         23        SEND_VAR_EX                                              !1
         24        CHECK_FUNC_ARG                                           
         25        FETCH_OBJ_FUNC_ARG                               $13     'roots'
         26        SEND_FUNC_ARG                                            $13
         27        DO_FCALL                                      0  $14     
         28        ASSIGN_REF                                               !2, $14
   18    29        ISSET_ISEMPTY_CV                                 ~16     !2
         30        BOOL_NOT                                         ~17     ~16
         31      > JMPZ                                                     ~17, ->39
   19    32    >   NEW                                              $18     'InvalidArgumentException'
         33        ROPE_INIT                                     3  ~20     'Parent+node%3A+%27'
         34        ROPE_ADD                                      1  ~20     ~20, !1
         35        ROPE_END                                      2  ~19     ~20, '%27+not+found.'
         36        SEND_VAL_EX                                              ~19
         37        DO_FCALL                                      0          
         38      > THROW                                         0          $18
   21    39    >   ASSIGN_DIM                                               !2, !0
         40        OP_DATA                                                  <array>
   22    41      > RETURN                                                   null

End of function addcategory

Function getchildren:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 11, Position 2 = 18
Branch analysis from position: 11
1 jumps found. (Code = 108) Position 1 = -2
Branch analysis from position: 18
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/24HNi
function name:  getChildren
number of ops:  23
compiled vars:  !0 = $parent, !1 = $node
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   24     0  E >   RECV                                             !0      
   26     1        INIT_METHOD_CALL                                         'findNode'
          2        SEND_VAR_EX                                              !0
          3        CHECK_FUNC_ARG                                           
          4        FETCH_OBJ_FUNC_ARG                               $2      'roots'
          5        SEND_FUNC_ARG                                            $2
          6        DO_FCALL                                      0  $3      
          7        ASSIGN                                                   !1, $3
   27     8        ISSET_ISEMPTY_CV                                 ~5      !1
          9        BOOL_NOT                                         ~6      ~5
         10      > JMPZ                                                     ~6, ->18
   28    11    >   NEW                                              $7      'InvalidArgumentException'
         12        ROPE_INIT                                     3  ~9      'Parent+node%3A+%27'
         13        ROPE_ADD                                      1  ~9      ~9, !0
         14        ROPE_END                                      2  ~8      ~9, '%27+not+found.'
         15        SEND_VAL_EX                                              ~8
         16        DO_FCALL                                      0          
         17      > THROW                                         0          $7
   30    18    >   INIT_FCALL                                               'array_keys'
         19        SEND_VAR                                                 !1
         20        DO_ICALL                                         $12     
         21      > RETURN                                                   $12
   31    22*     > RETURN                                                   null

End of function getchildren

Function findnode:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 10, Position 2 = 12
Branch analysis from position: 10
Return found
Branch analysis from position: 12
2 jumps found. (Code = 77) Position 1 = 13, Position 2 = 21
Branch analysis from position: 13
2 jumps found. (Code = 78) Position 1 = 14, Position 2 = 21
Branch analysis from position: 14
Return found
Branch analysis from position: 21
Return found
Branch analysis from position: 21
filename:       /in/24HNi
function name:  findNode
number of ops:  23
compiled vars:  !0 = $node, !1 = $root, !2 = $n
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   33     0  E >   RECV                                             !0      
          1        RECV                                             !1      
   34     2        INIT_FCALL                                               'in_array'
          3        SEND_VAR                                                 !0
          4        INIT_FCALL                                               'array_keys'
          5        SEND_VAR                                                 !1
          6        DO_ICALL                                         $3      
          7        SEND_VAR                                                 $3
          8        DO_ICALL                                         $4      
          9      > JMPZ                                                     $4, ->12
   35    10    >   FETCH_DIM_W                                      $5      !1, !0
         11      > RETURN_BY_REF                                            $5
   37    12    > > FE_RESET_R                                       $6      !1, ->21
         13    > > FE_FETCH_R                                               $6, !2, ->21
   38    14    >   INIT_METHOD_CALL                                         'findNode'
         15        SEND_VAR_EX                                              !0
         16        SEND_VAR_EX                                              !2
         17        DO_FCALL                                      0  $7      
         18        FE_FREE                                                  $6
         19      > RETURN_BY_REF                                            $7
   37    20*       JMP                                                      ->13
         21    >   FE_FREE                                                  $6
   40    22      > RETURN_BY_REF                                            null

End of function findnode

Function categoryexists:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 4, Position 2 = 16
Branch analysis from position: 4
2 jumps found. (Code = 78) Position 1 = 5, Position 2 = 16
Branch analysis from position: 5
2 jumps found. (Code = 43) Position 1 = 8, Position 2 = 10
Branch analysis from position: 8
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 10
1 jumps found. (Code = 42) Position 1 = 4
Branch analysis from position: 4
Branch analysis from position: 16
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 16
filename:       /in/24HNi
function name:  categoryExists
number of ops:  19
compiled vars:  !0 = $nodes, !1 = $category, !2 = $exists, !3 = $node, !4 = $key
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   42     0  E >   RECV                                             !0      
          1        RECV                                             !1      
   43     2        ASSIGN                                                   !2, <false>
   44     3      > FE_RESET_R                                       $6      !0, ->16
          4    > > FE_FETCH_R                                       ~7      $6, !3, ->16
          5    >   ASSIGN                                                   !4, ~7
   45     6        IS_IDENTICAL                                             !4, !1
          7      > JMPZ                                                     ~9, ->10
   46     8    >   FE_FREE                                                  $6
          9      > RETURN                                                   <true>
   48    10    >   INIT_METHOD_CALL                                         'categoryExists'
         11        SEND_VAR_EX                                              !3
         12        SEND_VAR_EX                                              !1
         13        DO_FCALL                                      0  $10     
         14        ASSIGN                                                   !2, $10
   44    15      > JMP                                                      ->4
         16    >   FE_FREE                                                  $6
   50    17      > RETURN                                                   !2
   51    18*     > RETURN                                                   null

End of function categoryexists

End of class CategoryTree.

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