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<?php $classes = str_repeat('dum-class ', 100000); $text = '<div><p class="' . $classes . '">Not a url.</p></div>'; $pcre_backtrack_limit = ini_get('pcre.backtrack_limit'); ini_set('pcre.backtrack_limit', 1); $chunks = preg_split('/(<.+?>)/is', $text, -1, PREG_SPLIT_DELIM_CAPTURE); $preg_last_error = preg_last_error(); var_dump($preg_last_error); var_dump($preg_last_error === PREG_BACKTRACK_LIMIT_ERROR); ini_set('pcre.backtrack_limit', $pcre_backtrack_limit);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/cVJP1
function name:  (null)
number of ops:  38
compiled vars:  !0 = $classes, !1 = $text, !2 = $pcre_backtrack_limit, !3 = $chunks, !4 = $preg_last_error
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'str_repeat'
          1        SEND_VAL                                                 'dum-class+'
          2        SEND_VAL                                                 100000
          3        DO_ICALL                                         $5      
          4        ASSIGN                                                   !0, $5
    4     5        CONCAT                                           ~7      '%3Cdiv%3E%3Cp+class%3D%22', !0
          6        CONCAT                                           ~8      ~7, '%22%3ENot+a+url.%3C%2Fp%3E%3C%2Fdiv%3E'
          7        ASSIGN                                                   !1, ~8
    6     8        INIT_FCALL                                               'ini_get'
          9        SEND_VAL                                                 'pcre.backtrack_limit'
         10        DO_ICALL                                         $10     
         11        ASSIGN                                                   !2, $10
    7    12        INIT_FCALL                                               'ini_set'
         13        SEND_VAL                                                 'pcre.backtrack_limit'
         14        SEND_VAL                                                 1
         15        DO_ICALL                                                 
    9    16        INIT_FCALL                                               'preg_split'
         17        SEND_VAL                                                 '%2F%28%3C.%2B%3F%3E%29%2Fis'
         18        SEND_VAR                                                 !1
         19        SEND_VAL                                                 -1
         20        SEND_VAL                                                 2
         21        DO_ICALL                                         $13     
         22        ASSIGN                                                   !3, $13
   11    23        INIT_FCALL                                               'preg_last_error'
         24        DO_ICALL                                         $15     
         25        ASSIGN                                                   !4, $15
   12    26        INIT_FCALL                                               'var_dump'
         27        SEND_VAR                                                 !4
         28        DO_ICALL                                                 
   13    29        INIT_FCALL                                               'var_dump'
         30        IS_IDENTICAL                                     ~18     !4, 2
         31        SEND_VAL                                                 ~18
         32        DO_ICALL                                                 
   15    33        INIT_FCALL                                               'ini_set'
         34        SEND_VAL                                                 'pcre.backtrack_limit'
         35        SEND_VAR                                                 !2
         36        DO_ICALL                                                 
         37      > RETURN                                                   1

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