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<?php $x = array("a", "b", "c", "d", "e"); $x = array_reduce($x, function($arr, $val) { array_push($arr, $val, $val); return $arr; }, []); var_dump($x);
Output for git.master, git.master_jit, rfc.property-hooks
array(10) { [0]=> string(1) "a" [1]=> string(1) "a" [2]=> string(1) "b" [3]=> string(1) "b" [4]=> string(1) "c" [5]=> string(1) "c" [6]=> string(1) "d" [7]=> string(1) "d" [8]=> string(1) "e" [9]=> string(1) "e" }

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