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<?php $array = ['a', 'b', 'c']; foreach ($array as $key => &$value) { $value = 'z'; } var_dump($array);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> string(1) "z" [1]=> string(1) "z" [2]=> &string(1) "z" }

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