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run code in 150+ php & hhvm versions
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<?php $array = array( '13' => 'z', '14' => 'b', '6' => 'a', '5' => 'a' ); ksort($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 ( [5] => a [6] => a [13] => z [14] => b )