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<?php $a = new stdClass; $a->b = 1; var_dump(isset($a)); var_dump(isset($a->b)); var_dump(isset($a->b->c)); var_dump(isset($a->b->c->d)); var_dump(isset($a->b->c->d->e));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/vbYDe
function name:  (null)
number of ops:  32
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   NEW                                              $1      'stdClass'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $1
    4     3        ASSIGN_OBJ                                               !0, 'b'
          4        OP_DATA                                                  1
    6     5        INIT_FCALL                                               'var_dump'
          6        ISSET_ISEMPTY_CV                                 ~5      !0
          7        SEND_VAL                                                 ~5
          8        DO_ICALL                                                 
    7     9        INIT_FCALL                                               'var_dump'
         10        ISSET_ISEMPTY_PROP_OBJ                           ~7      !0, 'b'
         11        SEND_VAL                                                 ~7
         12        DO_ICALL                                                 
    8    13        INIT_FCALL                                               'var_dump'
         14        FETCH_OBJ_IS                                     ~9      !0, 'b'
         15        ISSET_ISEMPTY_PROP_OBJ                           ~10     ~9, 'c'
         16        SEND_VAL                                                 ~10
         17        DO_ICALL                                                 
    9    18        INIT_FCALL                                               'var_dump'
         19        FETCH_OBJ_IS                                     ~12     !0, 'b'
         20        FETCH_OBJ_IS                                     ~13     ~12, 'c'
         21        ISSET_ISEMPTY_PROP_OBJ                           ~14     ~13, 'd'
         22        SEND_VAL                                                 ~14
         23        DO_ICALL                                                 
   10    24        INIT_FCALL                                               'var_dump'
         25        FETCH_OBJ_IS                                     ~16     !0, 'b'
         26        FETCH_OBJ_IS                                     ~17     ~16, 'c'
         27        FETCH_OBJ_IS                                     ~18     ~17, 'd'
         28        ISSET_ISEMPTY_PROP_OBJ                           ~19     ~18, 'e'
         29        SEND_VAL                                                 ~19
         30        DO_ICALL                                                 
         31      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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