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<?php $dom = new DOMDocument(); $dom->loadXML( '<foobar><a:foo xmlns:a="urn:a">'. '<b:bar xmlns:b="urn:b"/></a:foo>'. '</foobar>' ); $xpath = new DOMXPath($dom); //get context node and check "a:foo" $context = $dom->documentElement->firstChild; var_dump($context->tagName); // try to override the context node $xpath->registerNamespace('a', 'urn:b'); var_dump( $xpath->evaluate( 'descendant-or-self::a:*', $context )->item(0)->tagName ); // use a prefix not used in context $xpath->registerNamespace('prefix', 'urn:b'); var_dump( $xpath->evaluate( 'descendant-or-self::prefix:*', $context )->item(0)->tagName );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/QvGst
function name:  (null)
number of ops:  48
compiled vars:  !0 = $dom, !1 = $xpath, !2 = $context
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   NEW                                              $3      'DOMDocument'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $3
    3     3        INIT_METHOD_CALL                                         !0, 'loadXML'
    6     4        SEND_VAL_EX                                              '%3Cfoobar%3E%3Ca%3Afoo+xmlns%3Aa%3D%22urn%3Aa%22%3E%3Cb%3Abar+xmlns%3Ab%3D%22urn%3Ab%22%2F%3E%3C%2Fa%3Afoo%3E%3C%2Ffoobar%3E'
          5        DO_FCALL                                      0          
    8     6        NEW                                              $7      'DOMXPath'
          7        SEND_VAR_EX                                              !0
          8        DO_FCALL                                      0          
          9        ASSIGN                                                   !1, $7
   11    10        FETCH_OBJ_R                                      ~10     !0, 'documentElement'
         11        FETCH_OBJ_R                                      ~11     ~10, 'firstChild'
         12        ASSIGN                                                   !2, ~11
   12    13        INIT_FCALL                                               'var_dump'
         14        FETCH_OBJ_R                                      ~13     !2, 'tagName'
         15        SEND_VAL                                                 ~13
         16        DO_ICALL                                                 
   15    17        INIT_METHOD_CALL                                         !1, 'registerNamespace'
         18        SEND_VAL_EX                                              'a'
         19        SEND_VAL_EX                                              'urn%3Ab'
         20        DO_FCALL                                      0          
   16    21        INIT_FCALL                                               'var_dump'
   17    22        INIT_METHOD_CALL                                         !1, 'evaluate'
   18    23        SEND_VAL_EX                                              'descendant-or-self%3A%3Aa%3A%2A'
         24        SEND_VAR_EX                                              !2
         25        DO_FCALL                                      0  $16     
   20    26        INIT_METHOD_CALL                                         $16, 'item'
         27        SEND_VAL_EX                                              0
         28        DO_FCALL                                      0  $17     
         29        FETCH_OBJ_R                                      ~18     $17, 'tagName'
         30        SEND_VAL                                                 ~18
         31        DO_ICALL                                                 
   24    32        INIT_METHOD_CALL                                         !1, 'registerNamespace'
         33        SEND_VAL_EX                                              'prefix'
         34        SEND_VAL_EX                                              'urn%3Ab'
         35        DO_FCALL                                      0          
   25    36        INIT_FCALL                                               'var_dump'
   26    37        INIT_METHOD_CALL                                         !1, 'evaluate'
   27    38        SEND_VAL_EX                                              'descendant-or-self%3A%3Aprefix%3A%2A'
         39        SEND_VAR_EX                                              !2
         40        DO_FCALL                                      0  $21     
   29    41        INIT_METHOD_CALL                                         $21, 'item'
         42        SEND_VAL_EX                                              0
         43        DO_FCALL                                      0  $22     
         44        FETCH_OBJ_R                                      ~23     $22, 'tagName'
         45        SEND_VAL                                                 ~23
         46        DO_ICALL                                                 
   30    47      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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