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<?php $test = array(); var_dump(isset($test['Aanvraag']['product']));
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/fo58S
function name:  (null)
number of ops:  7
compiled vars:  !0 = $test
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   ASSIGN                                                   !0, <array>
   3     1        INIT_FCALL                                               'var_dump'
         2        FETCH_DIM_IS                                     $2      !0, 'Aanvraag'
         3        ISSET_ISEMPTY_DIM_OBJ                       33554432  ~3      $2, 'product'
         4        SEND_VAL                                                 ~3
         5        DO_ICALL                                                 
         6      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.1.0