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<?php $data = array('key' => null); var_dump(isset($data['key'])); var_dump(array_key_exists($data['key'])); var_dump(isset($data['key']) && $data['key']);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 46) Position 1 = 15, Position 2 = 17
Branch analysis from position: 15
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 17
filename:       /in/qT3vQ
function name:  (null)
number of ops:  20
compiled vars:  !0 = $data
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
    4     1        INIT_FCALL                                               'var_dump'
          2        ISSET_ISEMPTY_DIM_OBJ                         0  ~2      !0, 'key'
          3        SEND_VAL                                                 ~2
          4        DO_ICALL                                                 
    5     5        INIT_FCALL                                               'var_dump'
          6        INIT_FCALL                                               'array_key_exists'
          7        FETCH_DIM_R                                      ~4      !0, 'key'
          8        SEND_VAL                                                 ~4
          9        DO_ICALL                                         $5      
         10        SEND_VAR                                                 $5
         11        DO_ICALL                                                 
    6    12        INIT_FCALL                                               'var_dump'
         13        ISSET_ISEMPTY_DIM_OBJ                         0  ~7      !0, 'key'
         14      > JMPZ_EX                                          ~7      ~7, ->17
         15    >   FETCH_DIM_R                                      ~8      !0, 'key'
         16        BOOL                                             ~7      ~8
         17    >   SEND_VAL                                                 ~7
         18        DO_ICALL                                                 
         19      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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