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<?php $array = [ '1' => '2017-07-01', '2' => '2017-07-05', '3' => null, ]; asort($array); var_dump($array);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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
array(3) { [3]=> NULL [1]=> string(10) "2017-07-01" [2]=> string(10) "2017-07-05" }
preferences:
133.06 ms | 404 KiB | 174 Q