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<?php $x = ['a' => null]; var_dump(array_key_exists('a', $x));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/3sa2D
function name:  (null)
number of ops:  6
compiled vars:  !0 = $x
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    4     1        INIT_FCALL                                               'var_dump'
          2        ARRAY_KEY_EXISTS                                 ~2      'a', !0
          3        SEND_VAL                                                 ~2
          4        DO_ICALL                                                 
          5      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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