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<?php // Asume loginserver as 0 $_POST['loginserver'] = 0; if ($_POST['loginserver'] == 'login'){ print("Left to right conversion bug"); // This should not print } else{ print("Ok"); } // Proper Way $var = "login"; if ($var == $_POST['loginserver']){ print("Welcome"); // This should not print } else{ print("Proper Way"); }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 7, Position 2 = 9
Branch analysis from position: 7
1 jumps found. (Code = 42) Position 1 = 10
Branch analysis from position: 10
2 jumps found. (Code = 43) Position 1 = 15, Position 2 = 17
Branch analysis from position: 15
1 jumps found. (Code = 42) Position 1 = 18
Branch analysis from position: 18
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 17
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 9
2 jumps found. (Code = 43) Position 1 = 15, Position 2 = 17
Branch analysis from position: 15
Branch analysis from position: 17
filename:       /in/bqRTf
function name:  (null)
number of ops:  19
compiled vars:  !0 = $var
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   FETCH_W                      global              $1      '_POST'
          1        ASSIGN_DIM                                               $1, 'loginserver'
          2        OP_DATA                                                  0
    5     3        FETCH_R                      global              ~3      '_POST'
          4        FETCH_DIM_R                                      ~4      ~3, 'loginserver'
          5        IS_EQUAL                                                 ~4, 'login'
          6      > JMPZ                                                     ~5, ->9
    6     7    >   ECHO                                                     'Left+to+right+conversion+bug'
          8      > JMP                                                      ->10
    9     9    >   ECHO                                                     'Ok'
   13    10    >   ASSIGN                                                   !0, 'login'
   14    11        FETCH_R                      global              ~7      '_POST'
         12        FETCH_DIM_R                                      ~8      ~7, 'loginserver'
         13        IS_EQUAL                                                 !0, ~8
         14      > JMPZ                                                     ~9, ->17
   15    15    >   ECHO                                                     'Welcome'
         16      > JMP                                                      ->18
   17    17    >   ECHO                                                     'Proper+Way'
   18    18    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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