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<?php $dates = array( '2015-02-13', '2015-04-21', '2015-08-18', '2015-11-26', '2015-09-15', '2015-01-07', '2015-02-11', '2015-07-14', '2015-03-02', ); sort($dates); print_r($dates);
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Array ( [0] => 2015-01-07 [1] => 2015-02-11 [2] => 2015-02-13 [3] => 2015-03-02 [4] => 2015-04-21 [5] => 2015-07-14 [6] => 2015-08-18 [7] => 2015-09-15 [8] => 2015-11-26 )

preferences:
156.99 ms | 404 KiB | 177 Q