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<?php $suggestion = (object) array('Key' => 'pie'); var_dump( array_key_exists('Key', $suggestion), $suggestion['Key'] );
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/2vkO5
function name:  (null)
number of ops:  12
compiled vars:  !0 = $suggestion
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   CAST                                          8  ~1      <array>
         1        ASSIGN                                                   !0, ~1
   5     2        INIT_FCALL                                               'var_dump'
         3        INIT_FCALL                                               'array_key_exists'
   6     4        SEND_VAL                                                 'Key'
         5        SEND_VAR                                                 !0
         6        DO_ICALL                                         $3      
         7        SEND_VAR                                                 $3
   7     8        FETCH_DIM_R                                      $4      !0, 'Key'
         9        SEND_VAR                                                 $4
        10        DO_ICALL                                                 
        11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0