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<?php $_GET['foo'] = 'foo'; var_dump(filter_input(INPUT_GET, 'foo'));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/qUlMZ
function name:  (null)
number of ops:  11
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   FETCH_W                      global              $0      '_GET'
          1        ASSIGN_DIM                                               $0, 'foo'
          2        OP_DATA                                                  'foo'
    4     3        INIT_FCALL                                               'var_dump'
          4        INIT_FCALL                                               'filter_input'
          5        SEND_VAL                                                 1
          6        SEND_VAL                                                 'foo'
          7        DO_ICALL                                         $2      
          8        SEND_VAR                                                 $2
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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