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<?php $utc = new DateTimeZone('UTC'); $london = new DateTimeZone('Europe/London'); $test1 = new \DateTime('2018-01-31', $utc); $test2 = new \DateTime('2018-04-08', $london); $dateDiff = $test1->diff($test2); echo $dateDiff->y;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Wiane
function name:  (null)
number of ops:  25
compiled vars:  !0 = $utc, !1 = $london, !2 = $test1, !3 = $test2, !4 = $dateDiff
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   NEW                                              $5      'DateTimeZone'
          1        SEND_VAL_EX                                              'UTC'
          2        DO_FCALL                                      0          
          3        ASSIGN                                                   !0, $5
    3     4        NEW                                              $8      'DateTimeZone'
          5        SEND_VAL_EX                                              'Europe%2FLondon'
          6        DO_FCALL                                      0          
          7        ASSIGN                                                   !1, $8
    5     8        NEW                                              $11     'DateTime'
          9        SEND_VAL_EX                                              '2018-01-31'
         10        SEND_VAR_EX                                              !0
         11        DO_FCALL                                      0          
         12        ASSIGN                                                   !2, $11
    6    13        NEW                                              $14     'DateTime'
         14        SEND_VAL_EX                                              '2018-04-08'
         15        SEND_VAR_EX                                              !1
         16        DO_FCALL                                      0          
         17        ASSIGN                                                   !3, $14
    9    18        INIT_METHOD_CALL                                         !2, 'diff'
         19        SEND_VAR_EX                                              !3
         20        DO_FCALL                                      0  $17     
         21        ASSIGN                                                   !4, $17
   11    22        FETCH_OBJ_R                                      ~19     !4, 'y'
         23        ECHO                                                     ~19
   12    24      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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