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<?php $a = array("a", "b", "c", 1 => "d", 12 => "e", 10 => "f"); var_dump($a);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(5) { [0]=> string(1) "a" [1]=> string(1) "d" [2]=> string(1) "c" [12]=> string(1) "e" [10]=> string(1) "f" }