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<?php $_SESSION['fr_nick'] = null; var_dump( [ isset( $_SESSION['fr_nick'] ), array_key_exists('fr_nick', $_SESSION) ] );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/rW3eV
function name:  (null)
number of ops:  13
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   FETCH_W                      global              $0      '_SESSION'
          1        ASSIGN_DIM                                               $0, 'fr_nick'
          2        OP_DATA                                                  null
    4     3        INIT_FCALL                                               'var_dump'
    6     4        FETCH_IS                                         ~2      '_SESSION'
          5        ISSET_ISEMPTY_DIM_OBJ                         0  ~3      ~2, 'fr_nick'
          6        INIT_ARRAY                                       ~4      ~3
    7     7        FETCH_R                      global              ~5      '_SESSION'
          8        ARRAY_KEY_EXISTS                                 ~6      'fr_nick', ~5
          9        ADD_ARRAY_ELEMENT                                ~4      ~6
         10        SEND_VAL                                                 ~4
         11        DO_ICALL                                                 
    9    12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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