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<?php echo var_export(\DateTime::createFromFormat('!Ymd','20151203'),true);
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
\DateTime::__set_state(array( 'date' => '2015-12-03 00:00:00.000000', 'timezone_type' => 3, 'timezone' => 'Europe/Amsterdam', ))
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28
DateTime::__set_state(array( 'date' => '2015-12-03 00:00:00.000000', 'timezone_type' => 3, 'timezone' => 'Europe/Amsterdam', ))
Output for 7.3.32 - 7.3.33, 8.0.13
DateTime::__set_state(array( 'date' => '2015-12-03 00:00:00.000000', 'timezone_type' => 3, 'timezone' => 'UTC', ))

preferences:
162.29 ms | 401 KiB | 229 Q