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<?php $array = [ '1.1', '1.2', '1.3', '2.1', '2.2', '2.3', '3.1', '3.2', ]; $result = [null]; // temporary declaration unset($result[0]); // move pointer to 1 for next push foreach ($array as $v) { sscanf($v, '%d', $major); if (!isset($ref[$major])) { $result[] = &$ref[$major]; $ref[$major] = [null]; // temporary declaration unset($ref[$major][0]); // move pointer to 1 for next push } $ref[$major][] = $v; } var_export($result);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 4, Position 2 = 25
Branch analysis from position: 4
2 jumps found. (Code = 78) Position 1 = 5, Position 2 = 25
Branch analysis from position: 5
2 jumps found. (Code = 43) Position 1 = 13, Position 2 = 21
Branch analysis from position: 13
1 jumps found. (Code = 42) Position 1 = 4
Branch analysis from position: 4
Branch analysis from position: 21
Branch analysis from position: 25
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 25
filename:       /in/aN8Wt
function name:  (null)
number of ops:  30
compiled vars:  !0 = $array, !1 = $result, !2 = $v, !3 = $major, !4 = $ref
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
   14     1        ASSIGN                                                   !1, <array>
   15     2        UNSET_DIM                                                !1, 0
   16     3      > FE_RESET_R                                       $7      !0, ->25
          4    > > FE_FETCH_R                                               $7, !2, ->25
   17     5    >   INIT_FCALL                                               'sscanf'
          6        SEND_VAR                                                 !2
          7        SEND_VAL                                                 '%25d'
          8        SEND_REF                                                 !3
          9        DO_ICALL                                                 
   18    10        ISSET_ISEMPTY_DIM_OBJ                         0  ~9      !4, !3
         11        BOOL_NOT                                         ~10     ~9
         12      > JMPZ                                                     ~10, ->21
   19    13    >   FETCH_DIM_W                                      $12     !4, !3
         14        MAKE_REF                                         $13     $12
         15        FETCH_DIM_W                                      $11     !1
         16        ASSIGN_REF                                               $11, $13
   20    17        ASSIGN_DIM                                               !4, !3
         18        OP_DATA                                                  <array>
   21    19        FETCH_DIM_UNSET                                  $16     !4, !3
         20        UNSET_DIM                                                $16, 0
   23    21    >   FETCH_DIM_W                                      $17     !4, !3
         22        ASSIGN_DIM                                               $17
         23        OP_DATA                                                  !2
   16    24      > JMP                                                      ->4
         25    >   FE_FREE                                                  $7
   25    26        INIT_FCALL                                               'var_export'
         27        SEND_VAR                                                 !1
         28        DO_ICALL                                                 
         29      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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