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<?php //A timestamp indicates a fixed point in time, irregardless of timezone and daylight savings, so PHP must not change it when setting it: $x = new DateTime(); $x->setTimezone(new DateTimezone('America/Chicago')); $x->setTimestamp(1446357600); echo $x->format('c') . "\n"; $x->setTimestamp(1446361200); echo $x->format('c') . "\n"; //This should have a different offset since it's outside DST echo $x->getTimestamp(); //Simpler example $x = new DateTime(); $x->setTimezone(new DateTimezone('America/Chicago')); $x->setTimestamp(1446361200); echo $x->getTimestamp(); //Returns a different timestamp. No apparent way to specify a timestamp during the repeated hour.
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/HGGjd
function name:  (null)
number of ops:  44
compiled vars:  !0 = $x
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    4     0  E >   NEW                                                  $1      'DateTime'
          1        DO_FCALL                                          0          
          2        ASSIGN                                                       !0, $1
    5     3        INIT_METHOD_CALL                                             !0, 'setTimezone'
          4        NEW                                                  $4      'DateTimezone'
          5        SEND_VAL_EX                                                  'America%2FChicago'
          6        DO_FCALL                                          0          
          7        SEND_VAR_NO_REF_EX                                           $4
          8        DO_FCALL                                          0          
    6     9        INIT_METHOD_CALL                                             !0, 'setTimestamp'
         10        SEND_VAL_EX                                                  1446357600
         11        DO_FCALL                                          0          
    7    12        INIT_METHOD_CALL                                             !0, 'format'
         13        SEND_VAL_EX                                                  'c'
         14        DO_FCALL                                          0  $8      
         15        CONCAT                                               ~9      $8, '%0A'
         16        ECHO                                                         ~9
    9    17        INIT_METHOD_CALL                                             !0, 'setTimestamp'
         18        SEND_VAL_EX                                                  1446361200
         19        DO_FCALL                                          0          
   10    20        INIT_METHOD_CALL                                             !0, 'format'
         21        SEND_VAL_EX                                                  'c'
         22        DO_FCALL                                          0  $11     
         23        CONCAT                                               ~12     $11, '%0A'
         24        ECHO                                                         ~12
   11    25        INIT_METHOD_CALL                                             !0, 'getTimestamp'
         26        DO_FCALL                                          0  $13     
         27        ECHO                                                         $13
   14    28        NEW                                                  $14     'DateTime'
         29        DO_FCALL                                          0          
         30        ASSIGN                                                       !0, $14
   15    31        INIT_METHOD_CALL                                             !0, 'setTimezone'
         32        NEW                                                  $17     'DateTimezone'
         33        SEND_VAL_EX                                                  'America%2FChicago'
         34        DO_FCALL                                          0          
         35        SEND_VAR_NO_REF_EX                                           $17
         36        DO_FCALL                                          0          
   16    37        INIT_METHOD_CALL                                             !0, 'setTimestamp'
         38        SEND_VAL_EX                                                  1446361200
         39        DO_FCALL                                          0          
   17    40        INIT_METHOD_CALL                                             !0, 'getTimestamp'
         41        DO_FCALL                                          0  $21     
         42        ECHO                                                         $21
         43      > RETURN                                                       1

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