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<?php date_default_timezone_set('Australia/Perth'); $d=new DateTime(); var_dump($d); var_dump(serialize($d)); $d = (array)$d; $d['test']=3; var_dump(json_encode($d));
Output for 7.1.0
object(DateTime)#1 (3) { ["date"]=> string(26) "2014-06-20 10:30:06.003904" ["timezone_type"]=> int(3) ["timezone"]=> string(15) "Australia/Perth" } string(127) "O:8:"DateTime":3:{s:4:"date";s:26:"2014-06-20 10:30:06.003904";s:13:"timezone_type";i:3;s:8:"timezone";s:15:"Australia/Perth";}" string(94) "{"date":"2014-06-20 10:30:06.003904","timezone_type":3,"timezone":"Australia\/Perth","test":3}"
Output for 5.4.30 - 5.4.45, 5.5.14 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.0.14
object(DateTime)#1 (3) { ["date"]=> string(26) "2014-06-20 10:30:06.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(15) "Australia/Perth" } string(127) "O:8:"DateTime":3:{s:4:"date";s:26:"2014-06-20 10:30:06.000000";s:13:"timezone_type";i:3;s:8:"timezone";s:15:"Australia/Perth";}" string(94) "{"date":"2014-06-20 10:30:06.000000","timezone_type":3,"timezone":"Australia\/Perth","test":3}"
Output for 5.3.0 - 5.4.29, 5.5.0 - 5.5.13
object(DateTime)#1 (3) { ["date"]=> string(19) "2014-06-20 10:30:06" ["timezone_type"]=> int(3) ["timezone"]=> string(15) "Australia/Perth" } string(120) "O:8:"DateTime":3:{s:4:"date";s:19:"2014-06-20 10:30:06";s:13:"timezone_type";i:3;s:8:"timezone";s:15:"Australia/Perth";}" string(87) "{"date":"2014-06-20 10:30:06","timezone_type":3,"timezone":"Australia\/Perth","test":3}"
Output for 5.2.0 - 5.2.17
object(DateTime)#1 (0) { } string(19) "O:8:"DateTime":0:{}" string(10) "{"test":3}"
Output for 5.1.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/2tsk1 on line 4
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Fatal error: Call to undefined function date_default_timezone_set() in /in/2tsk1 on line 3
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: date_default_timezone_set() in /in/2tsk1 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: date_default_timezone_set() in /in/2tsk1 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: date_default_timezone_set() in /in/2tsk1 on line 3