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<?php $dates = [ null, new DateTime("now"), null, new DateTime("yesterday"), ]; $minDate = null; foreach ($dates as $date) { if ($date && (!$minDate || $date < $minDate)) { $minDate = $date; } } var_export($minDate);
Output for 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
\DateTime::__set_state(array( 'date' => '2020-05-14 00:00:00.000000', 'timezone_type' => 3, 'timezone' => 'Europe/Amsterdam', ))
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.3.33, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.33
DateTime::__set_state(array( 'date' => '2020-05-14 00:00:00.000000', 'timezone_type' => 3, 'timezone' => 'Europe/Amsterdam', ))
Output for 7.3.32, 7.4.26, 8.0.13
DateTime::__set_state(array( 'date' => '2020-05-13 00:00:00.000000', 'timezone_type' => 3, 'timezone' => 'UTC', ))

preferences:
137.88 ms | 409 KiB | 5 Q