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<?php print_r((new DateTime('1914-11-06 00:00:00'))->diff((new DateTime('1915-09-06 01:00:00')))); date_default_timezone_set('Europe/Berlin'); print_r((new DateTime('1914-11-06 00:00:00'))->diff((new DateTime('1915-09-06 01:00:00')))); date_default_timezone_set('Europe/Warsaw'); print_r((new DateTime('1914-11-06 00:00:00'))->diff((new DateTime('1915-09-06 01:00:00'))));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ARWFD
function name:  (null)
number of ops:  43
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'print_r'
          1        NEW                                              $0      'DateTime'
          2        SEND_VAL_EX                                              '1914-11-06+00%3A00%3A00'
          3        DO_FCALL                                      0          
          4        INIT_METHOD_CALL                                         $0, 'diff'
          5        NEW                                              $2      'DateTime'
          6        SEND_VAL_EX                                              '1915-09-06+01%3A00%3A00'
          7        DO_FCALL                                      0          
          8        SEND_VAR_NO_REF_EX                                       $2
          9        DO_FCALL                                      0  $4      
         10        SEND_VAR                                                 $4
         11        DO_ICALL                                                 
    3    12        INIT_FCALL                                               'date_default_timezone_set'
         13        SEND_VAL                                                 'Europe%2FBerlin'
         14        DO_ICALL                                                 
    4    15        INIT_FCALL                                               'print_r'
         16        NEW                                              $7      'DateTime'
         17        SEND_VAL_EX                                              '1914-11-06+00%3A00%3A00'
         18        DO_FCALL                                      0          
         19        INIT_METHOD_CALL                                         $7, 'diff'
         20        NEW                                              $9      'DateTime'
         21        SEND_VAL_EX                                              '1915-09-06+01%3A00%3A00'
         22        DO_FCALL                                      0          
         23        SEND_VAR_NO_REF_EX                                       $9
         24        DO_FCALL                                      0  $11     
         25        SEND_VAR                                                 $11
         26        DO_ICALL                                                 
    5    27        INIT_FCALL                                               'date_default_timezone_set'
         28        SEND_VAL                                                 'Europe%2FWarsaw'
         29        DO_ICALL                                                 
    6    30        INIT_FCALL                                               'print_r'
         31        NEW                                              $14     'DateTime'
         32        SEND_VAL_EX                                              '1914-11-06+00%3A00%3A00'
         33        DO_FCALL                                      0          
         34        INIT_METHOD_CALL                                         $14, 'diff'
         35        NEW                                              $16     'DateTime'
         36        SEND_VAL_EX                                              '1915-09-06+01%3A00%3A00'
         37        DO_FCALL                                      0          
         38        SEND_VAR_NO_REF_EX                                       $16
         39        DO_FCALL                                      0  $18     
         40        SEND_VAR                                                 $18
         41        DO_ICALL                                                 
         42      > RETURN                                                   1

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