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<?php $test = 'O:8:"DateTime":3:{s:4:"date";s:19:"2014-03-31 14:55:58";s:13:"timezone_type";i:3;s:8:"timezone";N;}'; var_dump( unserialize( $test ) );
Output for 7.1.0
Fatal error: Uncaught Error: Invalid serialization data for DateTime object in /in/7ZCCq:3 Stack trace: #0 [internal function]: DateTime->__wakeup() #1 /in/7ZCCq(3): unserialize('O:8:"DateTime":...') #2 {main} thrown in /in/7ZCCq on line 3
Process exited with code 255.
Output for 5.4.28 - 7.0.14
Fatal error: Invalid serialization data for DateTime object in /in/7ZCCq on line 3
Process exited with code 255.
Output for 5.3.0 - 5.4.27

Process exited with code 139.
Output for 5.2.0 - 5.2.17
object(DateTime)#1 (3) { ["date"]=> string(19) "2014-03-31 14:55:58" ["timezone_type"]=> int(3) ["timezone"]=> NULL }
Output for 5.0.0 - 5.1.6
object(__PHP_Incomplete_Class)#1 (4) { ["__PHP_Incomplete_Class_Name"]=> string(8) "DateTime" ["date"]=> string(19) "2014-03-31 14:55:58" ["timezone_type"]=> int(3) ["timezone"]=> NULL }
Output for 4.3.0 - 4.4.9
object(__PHP_Incomplete_Class)(4) { ["__PHP_Incomplete_Class_Name"]=> string(8) "datetime" ["date"]=> string(19) "2014-03-31 14:55:58" ["timezone_type"]=> int(3) ["timezone"]=> NULL }