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<?php var_dump(preg_match('/^-?\d+$/', new \stdClass())); var_dump(preg_match('/^-?\d+$/', '123')); var_dump(ctype_digit(0)); var_dump(ctype_digit("0")); var_dump(ctype_digit("1"));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/W4FI6
function name:  (null)
number of ops:  35
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'preg_match'
          2        SEND_VAL                                                 '%2F%5E-%3F%5Cd%2B%24%2F'
          3        NEW                                              $0      'stdClass'
          4        DO_FCALL                                      0          
          5        SEND_VAR                                                 $0
          6        DO_ICALL                                         $2      
          7        SEND_VAR                                                 $2
          8        DO_ICALL                                                 
    3     9        INIT_FCALL                                               'var_dump'
         10        INIT_FCALL                                               'preg_match'
         11        SEND_VAL                                                 '%2F%5E-%3F%5Cd%2B%24%2F'
         12        SEND_VAL                                                 '123'
         13        DO_ICALL                                         $4      
         14        SEND_VAR                                                 $4
         15        DO_ICALL                                                 
    4    16        INIT_FCALL                                               'var_dump'
         17        INIT_FCALL                                               'ctype_digit'
         18        SEND_VAL                                                 0
         19        DO_ICALL                                         $6      
         20        SEND_VAR                                                 $6
         21        DO_ICALL                                                 
    5    22        INIT_FCALL                                               'var_dump'
         23        INIT_FCALL                                               'ctype_digit'
         24        SEND_VAL                                                 '0'
         25        DO_ICALL                                         $8      
         26        SEND_VAR                                                 $8
         27        DO_ICALL                                                 
    6    28        INIT_FCALL                                               'var_dump'
         29        INIT_FCALL                                               'ctype_digit'
         30        SEND_VAL                                                 '1'
         31        DO_ICALL                                         $10     
         32        SEND_VAR                                                 $10
         33        DO_ICALL                                                 
         34      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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