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<?php function machine_forget(&$data) { $data &= null; } echo "normal\n"; $answer = 42; var_dump((string)$answer); machine_forget($answer); var_dump((string)$answer); echo "\n"; echo "magic\n"; // shhh no spoilers eval(base64_decode('CmNsYXNzIHpvbWJpZQp7CiAgICBwcm90ZWN0ZWQgJHZhbDsKICAgIHB1YmxpYyBmdW5jdGlvbiBfX2NvbnN0cnVjdCgkdmFsKQogICAgewogICAgICAgICR0aGlzLT52YWwgPSAkdmFsOwogICAgfQoKICAgIHB1YmxpYyBmdW5jdGlvbiBfX2Rlc3RydWN0KCkKICAgIHsKICAgICAgICAkdGhpcy0+dmVzc2VsID0gJHRoaXM7CiAgICB9CgogICAgcHVibGljIGZ1bmN0aW9uIF9fdG9TdHJpbmcoKQogICAgewogICAgICAgIHJldHVybiAkdGhpcy0+dmFsOwogICAgfQp9CgokYW5zd2VyID0gbmV3IHpvbWJpZSgiNDIiKTsKJGFuc3dlci0+dmVzc2VsID0gJiRhbnN3ZXI7')); var_dump((string)$answer); machine_forget($answer); var_dump((string)$answer); // DID NOT FORGET echo "\n"; echo "normal again\n"; $answer = 42; var_dump((string)$answer); machine_forget($answer); var_dump((string)$answer); // FORGOT
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/CC1fQ
function name:  (null)
number of ops:  45
compiled vars:  !0 = $answer
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    7     0  E >   ECHO                                                     'normal%0A'
    8     1        ASSIGN                                                   !0, 42
    9     2        INIT_FCALL                                               'var_dump'
          3        CAST                                          6  ~2      !0
          4        SEND_VAL                                                 ~2
          5        DO_ICALL                                                 
   10     6        INIT_FCALL                                               'machine_forget'
          7        SEND_REF                                                 !0
          8        DO_FCALL                                      0          
   11     9        INIT_FCALL                                               'var_dump'
         10        CAST                                          6  ~5      !0
         11        SEND_VAL                                                 ~5
         12        DO_ICALL                                                 
   12    13        ECHO                                                     '%0A'
   15    14        ECHO                                                     'magic%0A'
   17    15        INIT_FCALL                                               'base64_decode'
         16        SEND_VAL                                                 'CmNsYXNzIHpvbWJpZQp7CiAgICBwcm90ZWN0ZWQgJHZhbDsKICAgIHB1YmxpYyBmdW5jdGlvbiBfX2NvbnN0cnVjdCgkdmFsKQogICAgewogICAgICAgICR0aGlzLT52YWwgPSAkdmFsOwogICAgfQoKICAgIHB1YmxpYyBmdW5jdGlvbiBfX2Rlc3RydWN0KCkKICAgIHsKICAgICAgICAkdGhpcy0%2BdmVzc2VsID0gJHRoaXM7CiAgICB9CgogICAgcHVibGljIGZ1bmN0aW9uIF9fdG9TdHJpbmcoKQogICAgewogICAgICAgIHJldHVybiAkdGhpcy0%2BdmFsOwogICAgfQp9CgokYW5zd2VyID0gbmV3IHpvbWJpZSgiNDIiKTsKJGFuc3dlci0%2BdmVzc2VsID0gJiRhbnN3ZXI7'
         17        DO_ICALL                                         $7      
         18        INCLUDE_OR_EVAL                                          $7, EVAL
   19    19        INIT_FCALL                                               'var_dump'
         20        CAST                                          6  ~9      !0
         21        SEND_VAL                                                 ~9
         22        DO_ICALL                                                 
   20    23        INIT_FCALL                                               'machine_forget'
         24        SEND_REF                                                 !0
         25        DO_FCALL                                      0          
   21    26        INIT_FCALL                                               'var_dump'
         27        CAST                                          6  ~12     !0
         28        SEND_VAL                                                 ~12
         29        DO_ICALL                                                 
   23    30        ECHO                                                     '%0A'
   25    31        ECHO                                                     'normal+again%0A'
   26    32        ASSIGN                                                   !0, 42
   27    33        INIT_FCALL                                               'var_dump'
         34        CAST                                          6  ~15     !0
         35        SEND_VAL                                                 ~15
         36        DO_ICALL                                                 
   28    37        INIT_FCALL                                               'machine_forget'
         38        SEND_REF                                                 !0
         39        DO_FCALL                                      0          
   29    40        INIT_FCALL                                               'var_dump'
         41        CAST                                          6  ~18     !0
         42        SEND_VAL                                                 ~18
         43        DO_ICALL                                                 
   30    44      > RETURN                                                   1

Function machine_forget:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/CC1fQ
function name:  machine_forget
number of ops:  3
compiled vars:  !0 = $data
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
    4     1        ASSIGN_OP                                    10          !0, null
    5     2      > RETURN                                                   null

End of function machine_forget

Generated using Vulcan Logic Dumper, using php 8.0.0


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