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<?php var_dump(strlen('user_')); var_dump(mb_strlen('user_')); var_dump(substr('user_', 0, 2)); var_dump(mb_substr('user_', 0, 2)); var_dump(substr('user_', 2)); var_dump(mb_substr('user_', 2)); var_dump(strlen('Лорем')); var_dump(mb_strlen('Лорем')); var_dump(substr('Лорем', 0, 2)); var_dump(mb_substr('Лорем', 0, 2)); var_dump(substr('Лорем', 2)); var_dump(mb_substr('Лорем', 2)); echo 'This breaks your database because of the invalid char:' . "\n"; var_dump(substr('Лорем', 3)); var_dump(mb_substr('Лорем', 3));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/licri
function name:  (null)
number of ops:  94
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'var_dump'
          1        SEND_VAL                                                 5
          2        DO_ICALL                                                 
    4     3        INIT_FCALL                                               'var_dump'
          4        INIT_FCALL                                               'mb_strlen'
          5        SEND_VAL                                                 'user_'
          6        DO_ICALL                                         $1      
          7        SEND_VAR                                                 $1
          8        DO_ICALL                                                 
    5     9        INIT_FCALL                                               'var_dump'
         10        INIT_FCALL                                               'substr'
         11        SEND_VAL                                                 'user_'
         12        SEND_VAL                                                 0
         13        SEND_VAL                                                 2
         14        DO_ICALL                                         $3      
         15        SEND_VAR                                                 $3
         16        DO_ICALL                                                 
    6    17        INIT_FCALL                                               'var_dump'
         18        INIT_FCALL                                               'mb_substr'
         19        SEND_VAL                                                 'user_'
         20        SEND_VAL                                                 0
         21        SEND_VAL                                                 2
         22        DO_ICALL                                         $5      
         23        SEND_VAR                                                 $5
         24        DO_ICALL                                                 
    7    25        INIT_FCALL                                               'var_dump'
         26        INIT_FCALL                                               'substr'
         27        SEND_VAL                                                 'user_'
         28        SEND_VAL                                                 2
         29        DO_ICALL                                         $7      
         30        SEND_VAR                                                 $7
         31        DO_ICALL                                                 
    8    32        INIT_FCALL                                               'var_dump'
         33        INIT_FCALL                                               'mb_substr'
         34        SEND_VAL                                                 'user_'
         35        SEND_VAL                                                 2
         36        DO_ICALL                                         $9      
         37        SEND_VAR                                                 $9
         38        DO_ICALL                                                 
   11    39        INIT_FCALL                                               'var_dump'
         40        SEND_VAL                                                 10
         41        DO_ICALL                                                 
   12    42        INIT_FCALL                                               'var_dump'
         43        INIT_FCALL                                               'mb_strlen'
         44        SEND_VAL                                                 '%D0%9B%D0%BE%D1%80%D0%B5%D0%BC'
         45        DO_ICALL                                         $12     
         46        SEND_VAR                                                 $12
         47        DO_ICALL                                                 
   13    48        INIT_FCALL                                               'var_dump'
         49        INIT_FCALL                                               'substr'
         50        SEND_VAL                                                 '%D0%9B%D0%BE%D1%80%D0%B5%D0%BC'
         51        SEND_VAL                                                 0
         52        SEND_VAL                                                 2
         53        DO_ICALL                                         $14     
         54        SEND_VAR                                                 $14
         55        DO_ICALL                                                 
   14    56        INIT_FCALL                                               'var_dump'
         57        INIT_FCALL                                               'mb_substr'
         58        SEND_VAL                                                 '%D0%9B%D0%BE%D1%80%D0%B5%D0%BC'
         59        SEND_VAL                                                 0
         60        SEND_VAL                                                 2
         61        DO_ICALL                                         $16     
         62        SEND_VAR                                                 $16
         63        DO_ICALL                                                 
   15    64        INIT_FCALL                                               'var_dump'
         65        INIT_FCALL                                               'substr'
         66        SEND_VAL                                                 '%D0%9B%D0%BE%D1%80%D0%B5%D0%BC'
         67        SEND_VAL                                                 2
         68        DO_ICALL                                         $18     
         69        SEND_VAR                                                 $18
         70        DO_ICALL                                                 
   16    71        INIT_FCALL                                               'var_dump'
         72        INIT_FCALL                                               'mb_substr'
         73        SEND_VAL                                                 '%D0%9B%D0%BE%D1%80%D0%B5%D0%BC'
         74        SEND_VAL                                                 2
         75        DO_ICALL                                         $20     
         76        SEND_VAR                                                 $20
         77        DO_ICALL                                                 
   19    78        ECHO                                                     'This+breaks+your+database+because+of+the+invalid+char%3A%0A'
   20    79        INIT_FCALL                                               'var_dump'
         80        INIT_FCALL                                               'substr'
         81        SEND_VAL                                                 '%D0%9B%D0%BE%D1%80%D0%B5%D0%BC'
         82        SEND_VAL                                                 3
         83        DO_ICALL                                         $22     
         84        SEND_VAR                                                 $22
         85        DO_ICALL                                                 
   21    86        INIT_FCALL                                               'var_dump'
         87        INIT_FCALL                                               'mb_substr'
         88        SEND_VAL                                                 '%D0%9B%D0%BE%D1%80%D0%B5%D0%BC'
         89        SEND_VAL                                                 3
         90        DO_ICALL                                         $24     
         91        SEND_VAR                                                 $24
         92        DO_ICALL                                                 
         93      > RETURN                                                   1

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