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<?php $fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple"); function test_alter(&$item1, $key, $prefix) { $item1 = "$prefix: $item1"; } function test_print($item2, $key) { echo "$key. $item2<br />\n"; } echo "Before ...:\n"; array_walk($fruits, 'test_print'); // array_walk($fruits, 'test_alter', 'fruit'); echo "... and after:\n"; array_walk($fruits,function(&$value, &$key){$key = $value; $value=false;}); var_dump($fruits);
Output for git.master, git.master_jit, rfc.property-hooks
Before ...: d. lemon<br /> a. orange<br /> b. banana<br /> c. apple<br /> ... and after: Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/ER2rG on line 21 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/ER2rG on line 21 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/ER2rG on line 21 Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/ER2rG on line 21 array(4) { ["d"]=> bool(false) ["a"]=> bool(false) ["b"]=> bool(false) ["c"]=> bool(false) }

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