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run code in 150+ php & hhvm versions
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<?php $fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple"); function test(&$item, $key) { if($item == 'orange') $item = $key; } array_walk($fruits, 'test'); var_dump($fruits);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(4) { ["d"]=> string(5) "lemon" ["a"]=> string(1) "a" ["b"]=> string(6) "banana" ["c"]=> string(5) "apple" }
Output for hhvm-3.10.0

Process exited with code 153.