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<?php $fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple"); function test(&$item, $key) { if($item == 'orange') $item = $k; } array_walk($fruits, 'test'); var_dump($fruits);
Output for 5.0.4 - 7.1.0
Notice: Undefined variable: k in /in/dbqC8 on line 8 array(4) { ["d"]=> string(5) "lemon" ["a"]=> NULL ["b"]=> string(6) "banana" ["c"]=> string(5) "apple" }
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: k in /in/dbqC8 on line 8 array(4) { ["d"]=> string(5) "lemon" ["a"]=> NULL ["b"]=> string(6) "banana" ["c"]=> string(5) "apple" }