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<?php /* Challenge 1: Modify Test::$secret before it's output. Rules:: 1. No use of Reflection API / runkit extension 2. No stopping execution before Test::run() 3. No Exceptions or PHP errors / warnings notices allowed Hints: 1. Caesar 2. Magic methods 3. Requires a new feature of PHP 5.4 */ class Test { private $secret = 'Nyy lbhe Onfr ner orybat gb hf.'; private $callback; final public function run() { call_user_func($this->callback); return $this->secret . PHP_EOL; } public function __set($k, $v) { $key = $v[($v[$v])]; // $v is some kind of weird array $value = $v(); // and a callback! $this->{$key} = $value; } } $test = new Test; // start editing here $callback = array($callback, 'secret'); $callback(); // end editing here echo $test->run();
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Ig8Ia
function name:  (null)
number of ops:  12
compiled vars:  !0 = $test, !1 = $callback
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   41     0  E >   NEW                                              $2      'Test'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $2
   45     3        INIT_ARRAY                                       ~5      !1
          4        ADD_ARRAY_ELEMENT                                ~5      'secret'
          5        ASSIGN                                                   !1, ~5
   46     6        INIT_DYNAMIC_CALL                                        !1
          7        DO_FCALL                                      0          
   50     8        INIT_METHOD_CALL                                         !0, 'run'
          9        DO_FCALL                                      0  $8      
         10        ECHO                                                     $8
         11      > RETURN                                                   1

Class Test:
Function run:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Ig8Ia
function name:  run
number of ops:  7
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   27     0  E >   FETCH_OBJ_R                                      ~0      'callback'
          1        INIT_USER_CALL                                0          'call_user_func', ~0
          2        DO_FCALL                                      0          
   28     3        FETCH_OBJ_R                                      ~2      'secret'
          4        CONCAT                                           ~3      ~2, '%0A'
          5      > RETURN                                                   ~3
   29     6*     > RETURN                                                   null

End of function run

Function __set:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Ig8Ia
function name:  __set
number of ops:  11
compiled vars:  !0 = $k, !1 = $v, !2 = $key, !3 = $value
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   31     0  E >   RECV                                             !0      
          1        RECV                                             !1      
   33     2        FETCH_DIM_R                                      ~4      !1, !1
          3        FETCH_DIM_R                                      ~5      !1, ~4
          4        ASSIGN                                                   !2, ~5
   34     5        INIT_DYNAMIC_CALL                                        !1
          6        DO_FCALL                                      0  $7      
          7        ASSIGN                                                   !3, $7
   35     8        ASSIGN_OBJ                                               !2
          9        OP_DATA                                                  !3
   36    10      > RETURN                                                   null

End of function __set

End of class Test.

Generated using Vulcan Logic Dumper, using php 8.0.0


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