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<?php $a = array(); var_dump(isset($a['foo']['bar']['baz'])); var_dump(array_key_exists('baz', $a['foo']['bar']));
based on N23W2
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/AqeMh
function name:  (null)
number of ops:  17
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, <array>
   5     1        INIT_FCALL                                               'var_dump'
         2        FETCH_DIM_IS                                     $2      !0, 'foo'
         3        FETCH_DIM_IS                                     $3      $2, 'bar'
         4        ISSET_ISEMPTY_DIM_OBJ                       33554432  ~4      $3, 'baz'
         5        SEND_VAL                                                 ~4
         6        DO_ICALL                                                 
   6     7        INIT_FCALL                                               'var_dump'
         8        INIT_FCALL                                               'array_key_exists'
         9        SEND_VAL                                                 'baz'
        10        FETCH_DIM_R                                      $6      !0, 'foo'
        11        FETCH_DIM_R                                      $7      $6, 'bar'
        12        SEND_VAR                                                 $7
        13        DO_ICALL                                         $8      
        14        SEND_VAR                                                 $8
        15        DO_ICALL                                                 
        16      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0