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<?php $data=array('data'=>array('something')); echo "Good\n"; var_dump(isset($data['data'][0])); var_dump($data['data'][0]); echo "Bad\n"; var_dump(isset($data['data'][0]['data'])); var_dump(@$data['data'][0]['data']); echo "Ugly\n"; var_dump(isset($data['data'][0]['data'][0])); var_dump(@$data['data'][0]['data'][0]);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/iF8F4
function name:  (null)
number of ops:  45
compiled vars:  !0 = $data
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    5     1        ECHO                                                     'Good%0A'
    6     2        INIT_FCALL                                               'var_dump'
          3        FETCH_DIM_IS                                     ~2      !0, 'data'
          4        ISSET_ISEMPTY_DIM_OBJ                         0  ~3      ~2, 0
          5        SEND_VAL                                                 ~3
          6        DO_ICALL                                                 
    7     7        INIT_FCALL                                               'var_dump'
          8        FETCH_DIM_R                                      ~5      !0, 'data'
          9        FETCH_DIM_R                                      ~6      ~5, 0
         10        SEND_VAL                                                 ~6
         11        DO_ICALL                                                 
   10    12        ECHO                                                     'Bad%0A'
   11    13        INIT_FCALL                                               'var_dump'
         14        FETCH_DIM_IS                                     ~8      !0, 'data'
         15        FETCH_DIM_IS                                     ~9      ~8, 0
         16        ISSET_ISEMPTY_DIM_OBJ                         0  ~10     ~9, 'data'
         17        SEND_VAL                                                 ~10
         18        DO_ICALL                                                 
   12    19        INIT_FCALL                                               'var_dump'
         20        BEGIN_SILENCE                                    ~12     
         21        FETCH_DIM_R                                      ~13     !0, 'data'
         22        FETCH_DIM_R                                      ~14     ~13, 0
         23        FETCH_DIM_R                                      ~15     ~14, 'data'
         24        END_SILENCE                                              ~12
         25        SEND_VAL                                                 ~15
         26        DO_ICALL                                                 
   15    27        ECHO                                                     'Ugly%0A'
   16    28        INIT_FCALL                                               'var_dump'
         29        FETCH_DIM_IS                                     ~17     !0, 'data'
         30        FETCH_DIM_IS                                     ~18     ~17, 0
         31        FETCH_DIM_IS                                     ~19     ~18, 'data'
         32        ISSET_ISEMPTY_DIM_OBJ                         0  ~20     ~19, 0
         33        SEND_VAL                                                 ~20
         34        DO_ICALL                                                 
   17    35        INIT_FCALL                                               'var_dump'
         36        BEGIN_SILENCE                                    ~22     
         37        FETCH_DIM_R                                      ~23     !0, 'data'
         38        FETCH_DIM_R                                      ~24     ~23, 0
         39        FETCH_DIM_R                                      ~25     ~24, 'data'
         40        FETCH_DIM_R                                      ~26     ~25, 0
         41        END_SILENCE                                              ~22
         42        SEND_VAL                                                 ~26
         43        DO_ICALL                                                 
         44      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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