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run code in 150+ php & hhvm versions
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<?php $array = array( '13-2014' => 'z', '14-2014' => 'b', '6-2014' => 'a', '5-2014' => 'a' ); array_multisort($array, SORT_ASC); print_r($array);
Output for 7.1.0
Array ( [6-2014] => a [5-2014] => a [14-2014] => b [13-2014] => z )
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.0.14
Array ( [5-2014] => a [6-2014] => a [14-2014] => b [13-2014] => z )