Is it possible to specify more than one type hint for a parameter? [duplicate]

Answer 1

That is not possible to enforce (except inside the method). You can only provide a single type hint, and only to objects/interfaces and arrays (since PHP 5.1).

You can/should however document it in your method, i.e:

/**
 * @param string|Bar|Baz $param1
 */
function foo($param1);