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<?php $dp = new DateInterval('P2Y3W3D'); var_dump(isset($dp->d, $dp['d'])); echo $dp->d;
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 46) Position 1 = 7, Position 2 = 9
Branch analysis from position: 7
Jump found. (Code = 62) Position 1 = -2
Branch analysis from position: 9
filename:       /in/XQOQD
function name:  (null)
number of ops:  14
compiled vars:  !0 = $dp
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   NEW                                              $1      :-5
         1        SEND_VAL_EX                                              'P2Y3W3D'
         2        DO_FCALL                                      0          
         3        ASSIGN                                                   !0, $1
   4     4        INIT_FCALL                                               'var_dump'
         5        ISSET_ISEMPTY_PROP_OBJ                           ~4      !0, 'd'
         6      > JMPZ_EX                                          ~4      ~4, ->9
         7    >   ISSET_ISEMPTY_DIM_OBJ                       33554432  ~5      !0, 'd'
         8        BOOL                                             ~4      ~5
         9    >   SEND_VAL                                                 ~4
        10        DO_ICALL                                                 
   5    11        FETCH_OBJ_R                                      $7      !0, 'd'
        12        ECHO                                                     $7
        13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.1.0