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<?php $html = <<<HTML <div> <p>Paragraph one is okay </p> <h2>This will work without problem</h2> <p>Paragraph two is okay </p> <h2><a href="#">This heading has anchor</a></h2> <p>Paragraph one is okay </p> <h2> This heading start with space</h2> <p>Paragraph two is okay </p> <h3>1. <a href="https://www.example1.com/">This wont work</a></h3> <p>Paragraph one is okay </p> <h3>2. <a href="https://www.example2.com/">Not working</a></h3> <p>Paragraph two is okay </p> <h3>3. Neither this one</h3> <h3>But this works again</h3> </div> HTML; $dom = new DOMDocument; $dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD); $xpath = new DOMXPath($dom); foreach ($xpath->query("//h2 | //h3") as $node) { if (preg_match('~^\s*(?:\d+\.)?\s*\K\S+(?:\s+\S+){1,2}~', $node->nodeValue, $m)) { $node->setAttribute('id', str_replace(' ', '-', strtolower($m[0]))); } } echo $dom->saveHTML();
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 16, Position 2 = 38
Branch analysis from position: 16
2 jumps found. (Code = 78) Position 1 = 17, Position 2 = 38
Branch analysis from position: 17
2 jumps found. (Code = 43) Position 1 = 24, Position 2 = 37
Branch analysis from position: 24
1 jumps found. (Code = 42) Position 1 = 16
Branch analysis from position: 16
Branch analysis from position: 37
Branch analysis from position: 38
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 38
filename:       /in/27IaK
function name:  (null)
number of ops:  43
compiled vars:  !0 = $html, !1 = $dom, !2 = $xpath, !3 = $node, !4 = $m
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '%3Cdiv%3E%0A%3Cp%3EParagraph+one+is+okay+%3C%2Fp%3E%0A%3Ch2%3EThis+will+work+without+problem%3C%2Fh2%3E%0A%3Cp%3EParagraph+two+is+okay+%3C%2Fp%3E%0A%3Ch2%3E%3Ca+href%3D%22%23%22%3EThis+heading+has+anchor%3C%2Fa%3E%3C%2Fh2%3E%0A%3Cp%3EParagraph+one+is+okay+%3C%2Fp%3E%0A%3Ch2%3E++This+heading+start+with+space%3C%2Fh2%3E%0A%3Cp%3EParagraph+two+is+okay+%3C%2Fp%3E%0A%3Ch3%3E1.+%3Ca+href%3D%22https%3A%2F%2Fwww.example1.com%2F%22%3EThis+wont+work%3C%2Fa%3E%3C%2Fh3%3E%0A%3Cp%3EParagraph+one+is+okay+%3C%2Fp%3E%0A%3Ch3%3E2.+%3Ca+href%3D%22https%3A%2F%2Fwww.example2.com%2F%22%3ENot+working%3C%2Fa%3E%3C%2Fh3%3E%0A%3Cp%3EParagraph+two+is+okay+%3C%2Fp%3E%0A%3Ch3%3E3.+Neither+this+one%3C%2Fh3%3E%0A%3Ch3%3EBut+this+works+again%3C%2Fh3%3E%0A%3C%2Fdiv%3E'
   20     1        NEW                                              $6      'DOMDocument'
          2        DO_FCALL                                      0          
          3        ASSIGN                                                   !1, $6
   21     4        INIT_METHOD_CALL                                         !1, 'loadHTML'
          5        SEND_VAR_EX                                              !0
          6        SEND_VAL_EX                                              8196
          7        DO_FCALL                                      0          
   22     8        NEW                                              $10     'DOMXPath'
          9        SEND_VAR_EX                                              !1
         10        DO_FCALL                                      0          
         11        ASSIGN                                                   !2, $10
   23    12        INIT_METHOD_CALL                                         !2, 'query'
         13        SEND_VAL_EX                                              '%2F%2Fh2+%7C+%2F%2Fh3'
         14        DO_FCALL                                      0  $13     
         15      > FE_RESET_R                                       $14     $13, ->38
         16    > > FE_FETCH_R                                               $14, !3, ->38
   24    17    >   INIT_FCALL                                               'preg_match'
         18        SEND_VAL                                                 '%7E%5E%5Cs%2A%28%3F%3A%5Cd%2B%5C.%29%3F%5Cs%2A%5CK%5CS%2B%28%3F%3A%5Cs%2B%5CS%2B%29%7B1%2C2%7D%7E'
         19        FETCH_OBJ_R                                      ~15     !3, 'nodeValue'
         20        SEND_VAL                                                 ~15
         21        SEND_REF                                                 !4
         22        DO_ICALL                                         $16     
         23      > JMPZ                                                     $16, ->37
   25    24    >   INIT_METHOD_CALL                                         !3, 'setAttribute'
         25        SEND_VAL_EX                                              'id'
         26        INIT_FCALL                                               'str_replace'
         27        SEND_VAL                                                 '+'
         28        SEND_VAL                                                 '-'
         29        INIT_FCALL                                               'strtolower'
         30        FETCH_DIM_R                                      ~17     !4, 0
         31        SEND_VAL                                                 ~17
         32        DO_ICALL                                         $18     
         33        SEND_VAR                                                 $18
         34        DO_ICALL                                         $19     
         35        SEND_VAR_NO_REF_EX                                       $19
         36        DO_FCALL                                      0          
   23    37    > > JMP                                                      ->16
         38    >   FE_FREE                                                  $14
   28    39        INIT_METHOD_CALL                                         !1, 'saveHTML'
         40        DO_FCALL                                      0  $21     
         41        ECHO                                                     $21
         42      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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