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<?php $array = [ 1 => [ 1 => [ 'anna', 'alice' ], 2 => [ 'bob', 'bartold' ] ], 2 => [ 1 => [ 'carol' ], 2 => [ 'david' ] ] ]; $result = []; $prevKey = 0; array_walk_recursive($array, function ($value, $key) use (&$result, &$prevKey) { $prevKey = $key; if (!is_array($value)) { echo "{$prevKey} <br /> -- {$value} <br />"; } }); var_dump($result);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/HDh86
function name:  (null)
number of ops:  14
compiled vars:  !0 = $array, !1 = $result, !2 = $prevKey
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
   24     1        ASSIGN                                                   !1, <array>
   25     2        ASSIGN                                                   !2, 0
   26     3        INIT_FCALL                                               'array_walk_recursive'
          4        SEND_REF                                                 !0
          5        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FHDh86%3A26%240'
          6        BIND_LEXICAL                                             ~6, !1
          7        BIND_LEXICAL                                             ~6, !2
   31     8        SEND_VAL                                                 ~6
          9        DO_ICALL                                                 
   33    10        INIT_FCALL                                               'var_dump'
         11        SEND_VAR                                                 !1
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2FHDh86%3A26%240:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 8, Position 2 = 13
Branch analysis from position: 8
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 13
filename:       /in/HDh86
function name:  {closure}
number of ops:  14
compiled vars:  !0 = $value, !1 = $key, !2 = $result, !3 = $prevKey
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   26     0  E >   RECV                                             !0      
          1        RECV                                             !1      
          2        BIND_STATIC                                              !2
          3        BIND_STATIC                                              !3
   27     4        ASSIGN                                                   !3, !1
   28     5        TYPE_CHECK                                  128  ~5      !0
          6        BOOL_NOT                                         ~6      ~5
          7      > JMPZ                                                     ~6, ->13
   29     8    >   ROPE_INIT                                     4  ~8      !3
          9        ROPE_ADD                                      1  ~8      ~8, '+%3Cbr+%2F%3E+--+'
         10        ROPE_ADD                                      2  ~8      ~8, !0
         11        ROPE_END                                      3  ~7      ~8, '+%3Cbr+%2F%3E'
         12        ECHO                                                     ~7
   31    13    > > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FHDh86%3A26%240

Generated using Vulcan Logic Dumper, using php 8.0.0


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