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<?php session_start(); $_GET = parse_str('prefix=!&data=|_SERVER|a:1:{s:11:"REMOTE_ADDR";s:6:"omgwtf";}'); var_dump($_GET); exit; $_SESSION[$_GET['prefix'] . 'blah'] = $_GET['data'];
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 79) Position 1 = -2
filename:       /in/Y96qO
function name:  (null)
number of ops:  21
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'session_start'
          1        DO_ICALL                                                 
    4     2        INIT_FCALL                                               'parse_str'
          3        SEND_VAL                                                 'prefix%3D%21%26data%3D%7C_SERVER%7Ca%3A1%3A%7Bs%3A11%3A%22REMOTE_ADDR%22%3Bs%3A6%3A%22omgwtf%22%3B%7D'
          4        DO_ICALL                                         $2      
          5        FETCH_W                      global              $1      '_GET'
          6        ASSIGN                                                   $1, $2
    5     7        INIT_FCALL                                               'var_dump'
          8        FETCH_R                      global              ~4      '_GET'
          9        SEND_VAL                                                 ~4
         10        DO_ICALL                                                 
    6    11      > EXIT                                                     
    7    12*       FETCH_R                      global              ~7      '_GET'
         13*       FETCH_DIM_R                                      ~8      ~7, 'prefix'
         14*       CONCAT                                           ~9      ~8, 'blah'
         15*       FETCH_R                      global              ~11     '_GET'
         16*       FETCH_DIM_R                                      ~12     ~11, 'data'
         17*       FETCH_W                      global              $6      '_SESSION'
         18*       ASSIGN_DIM                                               $6, ~9
         19*       OP_DATA                                                  ~12
         20*     > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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