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<?php $dom = new DOMDocument(); $dom->loadXml('<foo><bar/></foo>'); var_dump(isset($dom->documentElement), $dom->documentElement->parentNode); var_dump(isset($dom->documentElement->parentNode), $dom->documentElement->parentNode); var_dump(isset($dom->documentElement->firstChild->parentNode), $dom->documentElement->firstChild->parentNode);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/91jUv
function name:  (null)
number of ops:  32
compiled vars:  !0 = $dom
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   NEW                                              $1      'DOMDocument'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $1
    4     3        INIT_METHOD_CALL                                         !0, 'loadXml'
          4        SEND_VAL_EX                                              '%3Cfoo%3E%3Cbar%2F%3E%3C%2Ffoo%3E'
          5        DO_FCALL                                      0          
    6     6        INIT_FCALL                                               'var_dump'
          7        ISSET_ISEMPTY_PROP_OBJ                           ~5      !0, 'documentElement'
          8        SEND_VAL                                                 ~5
          9        FETCH_OBJ_R                                      ~6      !0, 'documentElement'
         10        FETCH_OBJ_R                                      ~7      ~6, 'parentNode'
         11        SEND_VAL                                                 ~7
         12        DO_ICALL                                                 
    7    13        INIT_FCALL                                               'var_dump'
         14        FETCH_OBJ_IS                                     ~9      !0, 'documentElement'
         15        ISSET_ISEMPTY_PROP_OBJ                           ~10     ~9, 'parentNode'
         16        SEND_VAL                                                 ~10
         17        FETCH_OBJ_R                                      ~11     !0, 'documentElement'
         18        FETCH_OBJ_R                                      ~12     ~11, 'parentNode'
         19        SEND_VAL                                                 ~12
         20        DO_ICALL                                                 
    8    21        INIT_FCALL                                               'var_dump'
         22        FETCH_OBJ_IS                                     ~14     !0, 'documentElement'
         23        FETCH_OBJ_IS                                     ~15     ~14, 'firstChild'
         24        ISSET_ISEMPTY_PROP_OBJ                           ~16     ~15, 'parentNode'
         25        SEND_VAL                                                 ~16
         26        FETCH_OBJ_R                                      ~17     !0, 'documentElement'
         27        FETCH_OBJ_R                                      ~18     ~17, 'firstChild'
         28        FETCH_OBJ_R                                      ~19     ~18, 'parentNode'
         29        SEND_VAL                                                 ~19
         30        DO_ICALL                                                 
         31      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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