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run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr = array('11-01-2012', '01-01-2014', '01-01-2015', '09-02-2013', '01-01-2013'); function date_sort($a, $b) { return strtotime($a) - strtotime($b); } usort($arr, "date_sort"); print_r($arr);
Output for 5.3.28 - 5.6.30, hhvm-3.10.1 - 3.20.2, hhvm-3.22.0, 7.0.0 - 7.2.4
Array ( [0] => 11-01-2012 [1] => 01-01-2013 [2] => 09-02-2013 [3] => 01-01-2014 [4] => 01-01-2015 )
Output for hhvm-3.21.0

Process exited with code 137.