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<?php $a = new stdClass; $a->b = 1; echo 'Without isset.....'."\n";; var_dump(isset($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)); echo 'Without isset.....'."\n"; var_dump($a); var_dump($a->b); var_dump($a->b->c); var_dump($a->b->c->d); var_dump($a->b->c->d->e);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/coRIE
function name:  (null)
number of ops:  59
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   NEW                                              $1      'stdClass'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $1
    3     3        ASSIGN_OBJ                                               !0, 'b'
          4        OP_DATA                                                  1
    5     5        ECHO                                                     'Without+isset.....%0A'
    7     6        INIT_FCALL                                               'var_dump'
          7        ISSET_ISEMPTY_CV                                 ~5      !0
          8        SEND_VAL                                                 ~5
          9        DO_ICALL                                                 
    8    10        INIT_FCALL                                               'var_dump'
         11        ISSET_ISEMPTY_PROP_OBJ                           ~7      !0, 'b'
         12        SEND_VAL                                                 ~7
         13        DO_ICALL                                                 
    9    14        INIT_FCALL                                               'var_dump'
         15        FETCH_OBJ_IS                                     ~9      !0, 'b'
         16        ISSET_ISEMPTY_PROP_OBJ                           ~10     ~9, 'c'
         17        SEND_VAL                                                 ~10
         18        DO_ICALL                                                 
   10    19        INIT_FCALL                                               'var_dump'
         20        FETCH_OBJ_IS                                     ~12     !0, 'b'
         21        FETCH_OBJ_IS                                     ~13     ~12, 'c'
         22        ISSET_ISEMPTY_PROP_OBJ                           ~14     ~13, 'd'
         23        SEND_VAL                                                 ~14
         24        DO_ICALL                                                 
   11    25        INIT_FCALL                                               'var_dump'
         26        FETCH_OBJ_IS                                     ~16     !0, 'b'
         27        FETCH_OBJ_IS                                     ~17     ~16, 'c'
         28        FETCH_OBJ_IS                                     ~18     ~17, 'd'
         29        ISSET_ISEMPTY_PROP_OBJ                           ~19     ~18, 'e'
         30        SEND_VAL                                                 ~19
         31        DO_ICALL                                                 
   14    32        ECHO                                                     'Without+isset.....%0A'
   16    33        INIT_FCALL                                               'var_dump'
         34        SEND_VAR                                                 !0
         35        DO_ICALL                                                 
   17    36        INIT_FCALL                                               'var_dump'
         37        FETCH_OBJ_R                                      ~22     !0, 'b'
         38        SEND_VAL                                                 ~22
         39        DO_ICALL                                                 
   18    40        INIT_FCALL                                               'var_dump'
         41        FETCH_OBJ_R                                      ~24     !0, 'b'
         42        FETCH_OBJ_R                                      ~25     ~24, 'c'
         43        SEND_VAL                                                 ~25
         44        DO_ICALL                                                 
   19    45        INIT_FCALL                                               'var_dump'
         46        FETCH_OBJ_R                                      ~27     !0, 'b'
         47        FETCH_OBJ_R                                      ~28     ~27, 'c'
         48        FETCH_OBJ_R                                      ~29     ~28, 'd'
         49        SEND_VAL                                                 ~29
         50        DO_ICALL                                                 
   20    51        INIT_FCALL                                               'var_dump'
         52        FETCH_OBJ_R                                      ~31     !0, 'b'
         53        FETCH_OBJ_R                                      ~32     ~31, 'c'
         54        FETCH_OBJ_R                                      ~33     ~32, 'd'
         55        FETCH_OBJ_R                                      ~34     ~33, 'e'
         56        SEND_VAL                                                 ~34
         57        DO_ICALL                                                 
         58      > RETURN                                                   1

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