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<?php $a = new \DateTime('2016-03-13 3:00:00', new DateTimeZone('America/Los_Angeles')); echo $a->getTimeStamp(); $b = clone $a; $b->sub(new \DateInterval('PT1S')); echo $b->getTimeStamp(); print_r([$a,$b]);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/dUpBJ
function name:  (null)
number of ops:  28
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   NEW                                              $2      'DateTime'
          1        SEND_VAL_EX                                              '2016-03-13+3%3A00%3A00'
          2        NEW                                              $3      'DateTimeZone'
          3        SEND_VAL_EX                                              'America%2FLos_Angeles'
          4        DO_FCALL                                      0          
          5        SEND_VAR_NO_REF_EX                                       $3
          6        DO_FCALL                                      0          
          7        ASSIGN                                                   !0, $2
    4     8        INIT_METHOD_CALL                                         !0, 'getTimeStamp'
          9        DO_FCALL                                      0  $7      
         10        ECHO                                                     $7
    5    11        CLONE                                            ~8      !0
         12        ASSIGN                                                   !1, ~8
    6    13        INIT_METHOD_CALL                                         !1, 'sub'
         14        NEW                                              $10     'DateInterval'
         15        SEND_VAL_EX                                              'PT1S'
         16        DO_FCALL                                      0          
         17        SEND_VAR_NO_REF_EX                                       $10
         18        DO_FCALL                                      0          
    7    19        INIT_METHOD_CALL                                         !1, 'getTimeStamp'
         20        DO_FCALL                                      0  $13     
         21        ECHO                                                     $13
    8    22        INIT_FCALL                                               'print_r'
         23        INIT_ARRAY                                       ~14     !0
         24        ADD_ARRAY_ELEMENT                                ~14     !1
         25        SEND_VAL                                                 ~14
         26        DO_ICALL                                                 
         27      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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