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run code in 150+ php & hhvm versions
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<?php $a = array(1 => 'a', 0 => 'test'); asort($a);var_dump($a);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [1]=> string(1) "a" [0]=> string(4) "test" }