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<?php $var1 = "1"; $var2 = "2"; echo array_key_exists('var1', get_defined_vars()); ?>
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/26XRJ
function name:  (null)
number of ops:  7
compiled vars:  !0 = $var1, !1 = $var2
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '1'
    3     1        ASSIGN                                                   !1, '2'
    5     2        INIT_FCALL                                               'get_defined_vars'
          3        DO_ICALL                                         $4      
          4        ARRAY_KEY_EXISTS                                 ~5      'var1', $4
          5        ECHO                                                     ~5
    7     6      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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