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<?php var_dump(unserialize('O:8:"DateTime":3:{s:4:"date";s:19:"1970-01-01 00:00:00";s:13:"timezone_type";i:1;s:8:"timezone";s:6:"+01:00";}'));
Output for 5.4.30 - 5.4.45, 5.5.14 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
object(DateTime)#1 (3) { ["date"]=> string(26) "1970-01-01 00:00:00.000000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+01:00" }
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.29, 5.5.0 - 5.5.13
object(DateTime)#1 (3) { ["date"]=> string(19) "1970-01-01 00:00:00" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+01:00" }
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
object(__PHP_Incomplete_Class)#1 (4) { ["__PHP_Incomplete_Class_Name"]=> string(8) "DateTime" ["date"]=> string(19) "1970-01-01 00:00:00" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+01:00" }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
object(__PHP_Incomplete_Class)(4) { ["__PHP_Incomplete_Class_Name"]=> string(8) "datetime" ["date"]=> string(19) "1970-01-01 00:00:00" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+01:00" }

preferences:
249.7 ms | 402 KiB | 460 Q