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<?php var_dump(isset($a['asd']['fgh'])); $a['asd']['fgh'] = 'bla'; print_r($a);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/fHvBS
function name:  (null)
number of ops:  12
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'var_dump'
          1        FETCH_DIM_IS                                     ~1      !0, 'asd'
          2        ISSET_ISEMPTY_DIM_OBJ                         0  ~2      ~1, 'fgh'
          3        SEND_VAL                                                 ~2
          4        DO_ICALL                                                 
    3     5        FETCH_DIM_W                                      $4      !0, 'asd'
          6        ASSIGN_DIM                                               $4, 'fgh'
          7        OP_DATA                                                  'bla'
    4     8        INIT_FCALL                                               'print_r'
          9        SEND_VAR                                                 !0
         10        DO_ICALL                                                 
         11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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