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<?php $array = [ ['model' => 'iPhone 12', 'grade' => 'A', 'price' => '100'], ['model' => 'iPhone 12', 'grade' => 'A', 'price' => '95'], ['model' => 'iPhone 12', 'grade' => 'B', 'price' => '85'], ['model' => 'iPhone 12', 'grade' => 'C', 'price' => '75'], ]; $result = []; foreach ($array as $row) { $compositeKey = $row['model'] . '_' . $row['grade']; if (!isset($result[$compositeKey]) || $result[$compositeKey][$row['grade']] > $row['price']) { $result[$compositeKey] = [ 'model' => $row['model'], $row['grade'] => $row['price'] ]; } } var_export(array_values($result));
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 3, Position 2 = 27
Branch analysis from position: 3
2 jumps found. (Code = 78) Position 1 = 4, Position 2 = 27
Branch analysis from position: 4
2 jumps found. (Code = 47) Position 1 = 12, Position 2 = 18
Branch analysis from position: 12
2 jumps found. (Code = 43) Position 1 = 19, Position 2 = 26
Branch analysis from position: 19
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 26
Branch analysis from position: 18
Branch analysis from position: 27
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 27
filename:       /in/G3gi0
function name:  (null)
number of ops:  35
compiled vars:  !0 = $array, !1 = $result, !2 = $row, !3 = $compositeKey
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
   10     1        ASSIGN                                                   !1, <array>
   11     2      > FE_RESET_R                                       $6      !0, ->27
          3    > > FE_FETCH_R                                               $6, !2, ->27
   12     4    >   FETCH_DIM_R                                      ~7      !2, 'model'
          5        CONCAT                                           ~8      ~7, '_'
          6        FETCH_DIM_R                                      ~9      !2, 'grade'
          7        CONCAT                                           ~10     ~8, ~9
          8        ASSIGN                                                   !3, ~10
   13     9        ISSET_ISEMPTY_DIM_OBJ                         0  ~12     !1, !3
         10        BOOL_NOT                                         ~13     ~12
         11      > JMPNZ_EX                                         ~13     ~13, ->18
         12    >   FETCH_DIM_R                                      ~15     !2, 'grade'
         13        FETCH_DIM_R                                      ~14     !1, !3
         14        FETCH_DIM_R                                      ~16     ~14, ~15
         15        FETCH_DIM_R                                      ~17     !2, 'price'
         16        IS_SMALLER                                       ~18     ~17, ~16
         17        BOOL                                             ~13     ~18
         18    > > JMPZ                                                     ~13, ->26
   15    19    >   FETCH_DIM_R                                      ~20     !2, 'model'
         20        INIT_ARRAY                                       ~21     ~20, 'model'
   16    21        FETCH_DIM_R                                      ~22     !2, 'grade'
         22        FETCH_DIM_R                                      ~23     !2, 'price'
         23        ADD_ARRAY_ELEMENT                                ~21     ~23, ~22
   14    24        ASSIGN_DIM                                               !1, !3
   16    25        OP_DATA                                                  ~21
   11    26    > > JMP                                                      ->3
         27    >   FE_FREE                                                  $6
   20    28        INIT_FCALL                                               'var_export'
         29        INIT_FCALL                                               'array_values'
         30        SEND_VAR                                                 !1
         31        DO_ICALL                                         $24     
         32        SEND_VAR                                                 $24
         33        DO_ICALL                                                 
         34      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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