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<?php $a = ['a', ['b', ['c']]]; array_walk_recursive($a, function(&$i) { $i = 'z'; }); var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(1) "z" [1]=> array(2) { [0]=> string(1) "z" [1]=> array(1) { [0]=> string(1) "z" } } }

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