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<?php $array = [ [0 => 1, 1 => 5, 3 => null], [0 => 4, 1 => null, 3 => null], [0 => null, 1 => 5, 3 => 5] ]; $result = []; foreach ($array as $row) { foreach ($row as $k => $v) { $result[$k] = ($result[$k] ?? 0) + ($v !== null); } } var_export($result);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 3, Position 2 = 17
Branch analysis from position: 3
2 jumps found. (Code = 78) Position 1 = 4, Position 2 = 17
Branch analysis from position: 4
2 jumps found. (Code = 77) Position 1 = 5, Position 2 = 15
Branch analysis from position: 5
2 jumps found. (Code = 78) Position 1 = 6, Position 2 = 15
Branch analysis from position: 6
1 jumps found. (Code = 42) Position 1 = 5
Branch analysis from position: 5
Branch analysis from position: 15
1 jumps found. (Code = 42) Position 1 = 3
Branch analysis from position: 3
Branch analysis from position: 15
Branch analysis from position: 17
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 17
filename:       /in/s6Yil
function name:  (null)
number of ops:  22
compiled vars:  !0 = $array, !1 = $result, !2 = $row, !3 = $v, !4 = $k
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    9     1        ASSIGN                                                   !1, <array>
   10     2      > FE_RESET_R                                       $7      !0, ->17
          3    > > FE_FETCH_R                                               $7, !2, ->17
   11     4    > > FE_RESET_R                                       $8      !2, ->15
          5    > > FE_FETCH_R                                       ~9      $8, !3, ->15
          6    >   ASSIGN                                                   !4, ~9
   12     7        FETCH_DIM_IS                                     ~12     !1, !4
          8        COALESCE                                         ~13     ~12
          9        QM_ASSIGN                                        ~13     0
         10        TYPE_CHECK                                  1020  ~14     !3
         11        ADD                                              ~15     ~13, ~14
         12        ASSIGN_DIM                                               !1, !4
         13        OP_DATA                                                  ~15
   11    14      > JMP                                                      ->5
         15    >   FE_FREE                                                  $8
   10    16      > JMP                                                      ->3
         17    >   FE_FREE                                                  $7
   15    18        INIT_FCALL                                               'var_export'
         19        SEND_VAR                                                 !1
         20        DO_ICALL                                                 
         21      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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