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run code in 200+ php & hhvm versions
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<?php $a = array(1,5,16,7,4); asort($a); $a = array_keys($a); array_walk($a, function(&$value) { ++$value; }); var_dump($a);
based on Alu0d
Output for 5.3.19 - 7.2.0
array(5) { [0]=> int(1) [1]=> int(5) [2]=> int(2) [3]=> int(4) [4]=> int(3) }