Online PHP editor | refs for 4ZjK3

<?php $arr = Array ( "data" => 'check', "test1" => Array ( "data" => 'Hello', ), "test2" => Array ( "data" => 'world' ), "test3" => Array ( "data" => 'bar', "tst" => Array ( "data" => 'Lorem', "bar" => Array ( "data" => 'doller', "foo" => Array ( "data" => 'sit', ) ) ) ), "test4" => Array ( "data" => 'HELLO', "tst" => Array ( "data" => 'ipsum', "bar" => Array ( "data" => 'Lorem', ) ) ) ); $result = []; array_walk_recursive($arr, function($v) use (&$result) { $result[] = $v; }); echo implode('&', $result);