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<?php $categories = array( 'category_1' => array( 'name' => 'Category 1', 'column' => '1' ), 'category_2' => array( 'name' => 'Category 2', 'column' => '2' ), 'category_3' => array( 'name' => 'Category 2', 'column' => '1' ), 'category_4' => array( 'name' => 'Category 4', 'column' => '3' ), 'category_4' => array( 'name' => 'Category 4', 'column' => '2' ), ); $output = array(); foreach($categories as $catName => $category) { $columnNum = $category['column']; if (!isset($output[$columnNum] )) { $output[$columnNum] = array($catName); } else { $output[$columnNum][] = $catName; } } var_dump($output);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 3, Position 2 = 18
Branch analysis from position: 3
2 jumps found. (Code = 78) Position 1 = 4, Position 2 = 18
Branch analysis from position: 4
2 jumps found. (Code = 43) Position 1 = 10, Position 2 = 14
Branch analysis from position: 10
1 jumps found. (Code = 42) Position 1 = 17
Branch analysis from position: 17
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 14
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 18
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 18
filename:       /in/Uu3Ym
function name:  (null)
number of ops:  23
compiled vars:  !0 = $categories, !1 = $output, !2 = $category, !3 = $catName, !4 = $columnNum
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
   25     1        ASSIGN                                                   !1, <array>
   27     2      > FE_RESET_R                                       $7      !0, ->18
          3    > > FE_FETCH_R                                       ~8      $7, !2, ->18
          4    >   ASSIGN                                                   !3, ~8
   28     5        FETCH_DIM_R                                      ~10     !2, 'column'
          6        ASSIGN                                                   !4, ~10
   30     7        ISSET_ISEMPTY_DIM_OBJ                         0  ~12     !1, !4
          8        BOOL_NOT                                         ~13     ~12
          9      > JMPZ                                                     ~13, ->14
   31    10    >   INIT_ARRAY                                       ~15     !3
         11        ASSIGN_DIM                                               !1, !4
         12        OP_DATA                                                  ~15
         13      > JMP                                                      ->17
   33    14    >   FETCH_DIM_W                                      $16     !1, !4
         15        ASSIGN_DIM                                               $16
         16        OP_DATA                                                  !3
   27    17    > > JMP                                                      ->3
         18    >   FE_FREE                                                  $7
   37    19        INIT_FCALL                                               'var_dump'
         20        SEND_VAR                                                 !1
         21        DO_ICALL                                                 
         22      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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