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<?php /* Challenge 1: Read and write to 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 4. No redefining $test Hints: 1. Caesar 2. Magic methods 3. Requires something that became available in 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 $testArray = (array) $test; print_r($testArray); echo array_shift($testArray); // end editing here echo $test->run();
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/OSae8
function name:  (null)
number of ops:  16
compiled vars:  !0 = $test, !1 = $testArray
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   30     0  E >   NEW                                              $2      'Test'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $2
   33     3        CAST                                          7  ~5      !0
          4        ASSIGN                                                   !1, ~5
   34     5        INIT_FCALL                                               'print_r'
          6        SEND_VAR                                                 !1
          7        DO_ICALL                                                 
   35     8        INIT_FCALL                                               'array_shift'
          9        SEND_REF                                                 !1
         10        DO_ICALL                                         $8      
         11        ECHO                                                     $8
   38    12        INIT_METHOD_CALL                                         !0, 'run'
         13        DO_FCALL                                      0  $9      
         14        ECHO                                                     $9
         15      > RETURN                                                   1

Class Test:
Function run:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/OSae8
function name:  run
number of ops:  7
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   20     0  E >   FETCH_OBJ_R                                      ~0      'callback'
          1        INIT_USER_CALL                                0          'call_user_func', ~0
          2        DO_FCALL                                      0          
   21     3        FETCH_OBJ_R                                      ~2      'secret'
          4        CONCAT                                           ~3      ~2, '%0A'
          5      > RETURN                                                   ~3
   22     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/OSae8
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
-------------------------------------------------------------------------------------
   23     0  E >   RECV                                             !0      
          1        RECV                                             !1      
   25     2        FETCH_DIM_R                                      ~4      !1, !1
          3        FETCH_DIM_R                                      ~5      !1, ~4
          4        ASSIGN                                                   !2, ~5
   26     5        INIT_DYNAMIC_CALL                                        !1
          6        DO_FCALL                                      0  $7      
          7        ASSIGN                                                   !3, $7
   27     8        ASSIGN_OBJ                                               !2
          9        OP_DATA                                                  !3
   28    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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