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<?php $o = new DateInterval('PT0S'); isset($o->f); // 7.1 isset($o->z); // no z prop
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/UoL0e
function name:  (null)
number of ops:  9
compiled vars:  !0 = $o
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   NEW                                              $1      'DateInterval'
          1        SEND_VAL_EX                                              'PT0S'
          2        DO_FCALL                                      0          
          3        ASSIGN                                                   !0, $1
    4     4        ISSET_ISEMPTY_PROP_OBJ                           ~4      !0, 'f'
          5        FREE                                                     ~4
    5     6        ISSET_ISEMPTY_PROP_OBJ                           ~5      !0, 'z'
          7        FREE                                                     ~5
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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