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<?php $a = array(1, 2, array(3, array(4, 5))); array_walk_recursive($a, function(&$v, $k) { $v = $v * 2; }); var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> int(2) [1]=> int(4) [2]=> array(2) { [0]=> int(6) [1]=> array(2) { [0]=> int(8) [1]=> int(10) } } }

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