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<?php $regex = ' (?<types> (?: (?:\{ (?&types) \}) | (a) ) (\*?) ) '; ini_set('pcre.jit', '0'); $res = preg_match('{^' . $regex . '$}x', '{a}', $matches); ini_set('pcre.jit', '1'); // regex must be different to prevent regex cache, so just add 2nd "x" modifier $res2 = preg_match('{^' . $regex . '$}xx', '{a}', $matches2); var_dump($matches === $matches2); echo 'without JIT:' . "\n"; print_r($matches); echo "\n"; echo 'with JIT:' . "\n"; print_r($matches2);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/a9nLn
function name:  (null)
number of ops:  39
compiled vars:  !0 = $regex, !1 = $res, !2 = $matches, !3 = $res2, !4 = $matches2
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%0A++++%28%3F%3Ctypes%3E%0A++++++++%28%3F%3A%0A++++++++++++%28%3F%3A%5C%7B+%28%3F%26types%29+%5C%7D%29%0A++++++++++++%7C+%28a%29%0A++++++++%29%0A++++++++%28%5C%2A%3F%29%0A++++%29%0A'
   13     1        INIT_FCALL                                               'ini_set'
          2        SEND_VAL                                                 'pcre.jit'
          3        SEND_VAL                                                 '0'
          4        DO_ICALL                                                 
   14     5        INIT_FCALL                                               'preg_match'
          6        CONCAT                                           ~7      '%7B%5E', !0
          7        CONCAT                                           ~8      ~7, '%24%7Dx'
          8        SEND_VAL                                                 ~8
          9        SEND_VAL                                                 '%7Ba%7D'
         10        SEND_REF                                                 !2
         11        DO_ICALL                                         $9      
         12        ASSIGN                                                   !1, $9
   15    13        INIT_FCALL                                               'ini_set'
         14        SEND_VAL                                                 'pcre.jit'
         15        SEND_VAL                                                 '1'
         16        DO_ICALL                                                 
   17    17        INIT_FCALL                                               'preg_match'
         18        CONCAT                                           ~12     '%7B%5E', !0
         19        CONCAT                                           ~13     ~12, '%24%7Dxx'
         20        SEND_VAL                                                 ~13
         21        SEND_VAL                                                 '%7Ba%7D'
         22        SEND_REF                                                 !4
         23        DO_ICALL                                         $14     
         24        ASSIGN                                                   !3, $14
   19    25        INIT_FCALL                                               'var_dump'
         26        IS_IDENTICAL                                     ~16     !2, !4
         27        SEND_VAL                                                 ~16
         28        DO_ICALL                                                 
   21    29        ECHO                                                     'without+JIT%3A%0A'
   22    30        INIT_FCALL                                               'print_r'
         31        SEND_VAR                                                 !2
         32        DO_ICALL                                                 
   23    33        ECHO                                                     '%0A'
   24    34        ECHO                                                     'with+JIT%3A%0A'
   25    35        INIT_FCALL                                               'print_r'
         36        SEND_VAR                                                 !4
         37        DO_ICALL                                                 
         38      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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