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<?php $a = [ ['l' => 1, 's' => 'a'], ['l' => 2, 's' => 'a'], ['l' => 3, 's' => 'b'], ]; $processed = []; foreach ($a as $v) { $processed[$v['s']][] = $v['l']; } $processed = array_map(function($v) {return implode(',', $v);}, $processed); print_r($processed);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 3, Position 2 = 10
Branch analysis from position: 3
2 jumps found. (Code = 78) Position 1 = 4, Position 2 = 10
Branch analysis from position: 4
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 10
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 10
filename:       /in/6rdWG
function name:  (null)
number of ops:  21
compiled vars:  !0 = $a, !1 = $processed, !2 = $v
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   ASSIGN                                                   !0, <array>
   11     1        ASSIGN                                                   !1, <array>
   13     2      > FE_RESET_R                                       $5      !0, ->10
          3    > > FE_FETCH_R                                               $5, !2, ->10
   14     4    >   FETCH_DIM_R                                      ~6      !2, 's'
          5        FETCH_DIM_R                                      ~9      !2, 'l'
          6        FETCH_DIM_W                                      $7      !1, ~6
          7        ASSIGN_DIM                                               $7
          8        OP_DATA                                                  ~9
   13     9      > JMP                                                      ->3
         10    >   FE_FREE                                                  $5
   17    11        INIT_FCALL                                               'array_map'
         12        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2F6rdWG%3A17%240'
         13        SEND_VAL                                                 ~10
         14        SEND_VAR                                                 !1
         15        DO_ICALL                                         $11     
         16        ASSIGN                                                   !1, $11
   19    17        INIT_FCALL                                               'print_r'
         18        SEND_VAR                                                 !1
         19        DO_ICALL                                                 
         20      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2F6rdWG%3A17%240:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/6rdWG
function name:  {closure}
number of ops:  7
compiled vars:  !0 = $v
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   17     0  E >   RECV                                             !0      
          1        INIT_FCALL                                               'implode'
          2        SEND_VAL                                                 '%2C'
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                         $1      
          5      > RETURN                                                   $1
          6*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2F6rdWG%3A17%240

Generated using Vulcan Logic Dumper, using php 8.0.0


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