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<?php $s1 = '<?xml version="1.0"?> <!DOCTYPE lolz [ <!ENTITY lol "lol"> <!ENTITY lol1 "&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;&lol;"> <!ENTITY lol2 "&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;&lol1;"> <!ENTITY lol3 "&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;&lol2;"> <!ENTITY lol4 "&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;&lol3;"> <!ENTITY lol5 "&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;&lol4;"> <!ENTITY lol6 "&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;&lol5;"> <!ENTITY lol7 "&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;&lol6;"> <!ENTITY lol8 "&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;&lol7;"> <!ENTITY lol9 "&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;&lol8;"> ]> <lolz>&lol9;</lolz>'; $s2 = '<?xml version="1.0"?><!DOCTYPE kaboom [ <!ENTITY a "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"> ]> <kaboom>&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;&a;</kaboom>'; $doc = new DOMDocument(); $doc->loadXML($s1); echo strlen($doc->lastChild->nodeValue); $doc = new DOMDocument(); $doc->loadXML($s2); echo strlen($doc->lastChild->nodeValue);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/oEWFn
function name:  (null)
number of ops:  23
compiled vars:  !0 = $s1, !1 = $s2, !2 = $doc
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '%3C%3Fxml+version%3D%221.0%22%3F%3E%0A%3C%21DOCTYPE+lolz+%5B%0A++%3C%21ENTITY+lol+%22lol%22%3E%0A++%3C%21ENTITY+lol1+%22%26lol%3B%26lol%3B%26lol%3B%26lol%3B%26lol%3B%26lol%3B%26lol%3B%26lol%3B%26lol%3B%26lol%3B%22%3E%0A++%3C%21ENTITY+lol2+%22%26lol1%3B%26lol1%3B%26lol1%3B%26lol1%3B%26lol1%3B%26lol1%3B%26lol1%3B%26lol1%3B%26lol1%3B%26lol1%3B%22%3E%0A++%3C%21ENTITY+lol3+%22%26lol2%3B%26lol2%3B%26lol2%3B%26lol2%3B%26lol2%3B%26lol2%3B%26lol2%3B%26lol2%3B%26lol2%3B%26lol2%3B%22%3E%0A++%3C%21ENTITY+lol4+%22%26lol3%3B%26lol3%3B%26lol3%3B%26lol3%3B%26lol3%3B%26lol3%3B%26lol3%3B%26lol3%3B%26lol3%3B%26lol3%3B%22%3E%0A++%3C%21ENTITY+lol5+%22%26lol4%3B%26lol4%3B%26lol4%3B%26lol4%3B%26lol4%3B%26lol4%3B%26lol4%3B%26lol4%3B%26lol4%3B%26lol4%3B%22%3E%0A++%3C%21ENTITY+lol6+%22%26lol5%3B%26lol5%3B%26lol5%3B%26lol5%3B%26lol5%3B%26lol5%3B%26lol5%3B%26lol5%3B%26lol5%3B%26lol5%3B%22%3E%0A++%3C%21ENTITY+lol7+%22%26lol6%3B%26lol6%3B%26lol6%3B%26lol6%3B%26lol6%3B%26lol6%3B%26lol6%3B%26lol6%3B%26lol6%3B%26lol6%3B%22%3E%0A++%3C%21ENTITY+lol8+%22%26lol7%3B%26lol7%3B%26lol7%3B%26lol7%3B%26lol7%3B%26lol7%3B%26lol7%3B%26lol7%3B%26lol7%3B%26lol7%3B%22%3E%0A++%3C%21ENTITY+lol9+%22%26lol8%3B%26lol8%3B%26lol8%3B%26lol8%3B%26lol8%3B%26lol8%3B%26lol8%3B%26lol8%3B%26lol8%3B%26lol8%3B%22%3E%0A%5D%3E%0A%3Clolz%3E%26lol9%3B%3C%2Flolz%3E'
   17     1        ASSIGN                                                   !1, '%3C%3Fxml+version%3D%221.0%22%3F%3E%3C%21DOCTYPE+kaboom+%5B%0A++%3C%21ENTITY+a+%22aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa%22%3E%0A%5D%3E%0A%3Ckaboom%3E%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%26a%3B%3C%2Fkaboom%3E'
   22     2        NEW                                              $5      'DOMDocument'
          3        DO_FCALL                                      0          
          4        ASSIGN                                                   !2, $5
   23     5        INIT_METHOD_CALL                                         !2, 'loadXML'
          6        SEND_VAR_EX                                              !0
          7        DO_FCALL                                      0          
   24     8        FETCH_OBJ_R                                      ~9      !2, 'lastChild'
          9        FETCH_OBJ_R                                      ~10     ~9, 'nodeValue'
         10        STRLEN                                           ~11     ~10
         11        ECHO                                                     ~11
   26    12        NEW                                              $12     'DOMDocument'
         13        DO_FCALL                                      0          
         14        ASSIGN                                                   !2, $12
   27    15        INIT_METHOD_CALL                                         !2, 'loadXML'
         16        SEND_VAR_EX                                              !1
         17        DO_FCALL                                      0          
   28    18        FETCH_OBJ_R                                      ~16     !2, 'lastChild'
         19        FETCH_OBJ_R                                      ~17     ~16, 'nodeValue'
         20        STRLEN                                           ~18     ~17
         21        ECHO                                                     ~18
         22      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0

preferences:
160.04 ms | 1403 KiB | 13 Q