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<?php $_GET['id'] = true; var_dump(is_literal($_GET['id'])); // false var_dump(is_literal("$_GET[id]")); // false?
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/eDsAG
function name:  (null)
number of ops:  22
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   FETCH_W                      global              $0      '_GET'
          1        ASSIGN_DIM                                               $0, 'id'
          2        OP_DATA                                                  <true>
    5     3        INIT_FCALL                                               'var_dump'
          4        INIT_FCALL_BY_NAME                                       'is_literal'
          5        CHECK_FUNC_ARG                                           
          6        FETCH_FUNC_ARG               global              $2      '_GET'
          7        FETCH_DIM_FUNC_ARG                               $3      $2, 'id'
          8        SEND_FUNC_ARG                                            $3
          9        DO_FCALL                                      0  $4      
         10        SEND_VAR                                                 $4
         11        DO_ICALL                                                 
    6    12        INIT_FCALL                                               'var_dump'
         13        INIT_FCALL_BY_NAME                                       'is_literal'
         14        FETCH_R                      global              ~6      '_GET'
         15        FETCH_DIM_R                                      ~7      ~6, 'id'
         16        CAST                                          6  ~8      ~7
         17        SEND_VAL_EX                                              ~8
         18        DO_FCALL                                      0  $9      
         19        SEND_VAR                                                 $9
         20        DO_ICALL                                                 
         21      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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