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<?php $array = [0 => 'a']; $it = new RecursiveIteratorIterator( new RecursiveArrayIterator($array)); var_dump($it->key());
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/TV55h
function name:  (null)
number of ops:  14
compiled vars:  !0 = $array, !1 = $it
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
    4     1        NEW                                              $3      'RecursiveIteratorIterator'
    5     2        NEW                                              $4      'RecursiveArrayIterator'
          3        SEND_VAR_EX                                              !0
          4        DO_FCALL                                      0          
          5        SEND_VAR_NO_REF_EX                                       $4
          6        DO_FCALL                                      0          
    4     7        ASSIGN                                                   !1, $3
    6     8        INIT_FCALL                                               'var_dump'
          9        INIT_METHOD_CALL                                         !1, 'key'
         10        DO_FCALL                                      0  $8      
         11        SEND_VAR                                                 $8
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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