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<?php $test = [ '1' , '2', '3' ]; rsort($test); array_walk($test, 'intval'); var_dump($test);
based on DQKYf
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0beta1
array(3) { [0]=> string(1) "3" [1]=> string(1) "2" [2]=> string(1) "1" }