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<?php $a = []; $a['a'] = null; $a['b'] = false; var_dump(isset($a['a'])); var_dump(isset($a['b']));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/n5rPm
function name:  (null)
number of ops:  14
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
    3     1        ASSIGN_DIM                                               !0, 'a'
          2        OP_DATA                                                  null
    4     3        ASSIGN_DIM                                               !0, 'b'
          4        OP_DATA                                                  <false>
    5     5        INIT_FCALL                                               'var_dump'
          6        ISSET_ISEMPTY_DIM_OBJ                         0  ~4      !0, 'a'
          7        SEND_VAL                                                 ~4
          8        DO_ICALL                                                 
    6     9        INIT_FCALL                                               'var_dump'
         10        ISSET_ISEMPTY_DIM_OBJ                         0  ~6      !0, 'b'
         11        SEND_VAL                                                 ~6
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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