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<?php $d = new \DateTimeImmutable(); var_dump($d) ;var_dump($d->modify('+2 years'));
based on 75CRe
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/SesKo
function name:  (null)
number of ops:  13
compiled vars:  !0 = $d
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   NEW                                              $1      :21
         1        DO_FCALL                                      0          
         2        QM_ASSIGN                                                !0
   3     3        INIT_FCALL                                               'var_dump'
         4        SEND_VAR                                                 !0
         5        DO_ICALL                                                 
   4     6        INIT_FCALL                                               'var_dump'
         7        INIT_METHOD_CALL                                         !0, 'modify'
         8        SEND_VAL_EX                                              '%2B2+years'
         9        DO_FCALL                                      0  $5      
        10        SEND_VAR                                                 $5
        11        DO_ICALL                                                 
        12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0