3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a=array("14-10-2013","15-10-2013","16-10-2013","13-11-2013","17-11-2013","18-10-2013","19-10-2013"); asort(strtotime($a)); print_r($a);

preferences:
41.55 ms | 402 KiB | 5 Q