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<?php $array = array('a' => 'Hello', 'b' => 'World'); array_walk($array, 'adda'); function adda(&$value, &$key) { $key = "a".$key; } var_dump($array);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: adda(): Argument #2 ($key) must be passed by reference, value given in /in/b8gAJ on line 4 Warning: adda(): Argument #2 ($key) must be passed by reference, value given in /in/b8gAJ on line 4 array(2) { ["a"]=> string(5) "Hello" ["b"]=> string(5) "World" }

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