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<?php $array = array('23' => 3,'1' => 2,'2' => 12); ksort($array); print_r($array); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [1] => 2 [2] => 12 [23] => 3 )