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<?php $numbers = array(1,2,3,4,5,6); array_walk($numbers, function (&$n) { return $n + 10; }); var_dump($numbers);
Output for git.master, git.master_jit, rfc.property-hooks
array(6) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(6) }

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