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<?php $array = ["2019 Honda Civic" => "Sedan", "Maruti Suzuki Baleno" => "Hatchback", "Rolls-Royce Phantom" => "Sedan"]; $result = []; foreach ($array as $k=>$v) { if (!isset($result[$v])) $result[$v] = [$k]; else $result[$v][] = $k; } print_r($result);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 3, Position 2 = 16
Branch analysis from position: 3
2 jumps found. (Code = 78) Position 1 = 4, Position 2 = 16
Branch analysis from position: 4
2 jumps found. (Code = 43) Position 1 = 8, Position 2 = 12
Branch analysis from position: 8
1 jumps found. (Code = 42) Position 1 = 15
Branch analysis from position: 15
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 12
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 16
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 16
filename:       /in/o336l
function name:  (null)
number of ops:  21
compiled vars:  !0 = $array, !1 = $result, !2 = $v, !3 = $k
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    6     1        ASSIGN                                                   !1, <array>
    7     2      > FE_RESET_R                                       $6      !0, ->16
          3    > > FE_FETCH_R                                       ~7      $6, !2, ->16
          4    >   ASSIGN                                                   !3, ~7
    8     5        ISSET_ISEMPTY_DIM_OBJ                         0  ~9      !1, !2
          6        BOOL_NOT                                         ~10     ~9
          7      > JMPZ                                                     ~10, ->12
    9     8    >   INIT_ARRAY                                       ~12     !3
          9        ASSIGN_DIM                                               !1, !2
         10        OP_DATA                                                  ~12
    8    11      > JMP                                                      ->15
   11    12    >   FETCH_DIM_W                                      $13     !1, !2
         13        ASSIGN_DIM                                               $13
         14        OP_DATA                                                  !3
    7    15    > > JMP                                                      ->3
         16    >   FE_FREE                                                  $6
   13    17        INIT_FCALL                                               'print_r'
         18        SEND_VAR                                                 !1
         19        DO_ICALL                                                 
         20      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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