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run code in 300+ PHP versions simultaneously
<?php $array = array( '13-2014' => 'z', '14-2014' => 'b', '6-2014' => 'a', '5-2014' => 'x' ); uksort($array, function($a, $b) { echo $a; echo $b; }); //print_r($array);
Output for git.master, git.master_jit, rfc.property-hooks
13-201414-201414-20146-20146-20145-2014

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