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<?php $a = array('b' => 0); var_dump(is_set($a['b'])); ?>
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/J9rtI
function name:  (null)
number of ops:  10
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
    4     1        INIT_FCALL                                               'var_dump'
          2        INIT_FCALL_BY_NAME                                       'is_set'
          3        CHECK_FUNC_ARG                                           
          4        FETCH_DIM_FUNC_ARG                               $2      !0, 'b'
          5        SEND_FUNC_ARG                                            $2
          6        DO_FCALL                                      0  $3      
          7        SEND_VAR                                                 $3
          8        DO_ICALL                                                 
    5     9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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