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<?php $array = array('a' => 'Hello', 'b' => 'World'); array_walk($array, 'adda'); function adda(&$value, &$key) { $key = "a".$key; } var_dump($array);
Output for 4.3.0 - 7.1.0
array(2) { ["a"]=> string(5) "Hello" ["b"]=> string(5) "World" }