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<?php $a = []; $a['a'] = 'a'; var_dump(isset($a['a'])); var_dump(isset($a['a']['b'])); var_dump(isset($a['a']['b']['c']));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/800WE
function name:  (null)
number of ops:  19
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
    3     1        ASSIGN_DIM                                               !0, 'a'
          2        OP_DATA                                                  'a'
    4     3        INIT_FCALL                                               'var_dump'
          4        ISSET_ISEMPTY_DIM_OBJ                         0  ~3      !0, 'a'
          5        SEND_VAL                                                 ~3
          6        DO_ICALL                                                 
    5     7        INIT_FCALL                                               'var_dump'
          8        FETCH_DIM_IS                                     ~5      !0, 'a'
          9        ISSET_ISEMPTY_DIM_OBJ                         0  ~6      ~5, 'b'
         10        SEND_VAL                                                 ~6
         11        DO_ICALL                                                 
    6    12        INIT_FCALL                                               'var_dump'
         13        FETCH_DIM_IS                                     ~8      !0, 'a'
         14        FETCH_DIM_IS                                     ~9      ~8, 'b'
         15        ISSET_ISEMPTY_DIM_OBJ                         0  ~10     ~9, 'c'
         16        SEND_VAL                                                 ~10
         17        DO_ICALL                                                 
         18      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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