- var_dump: documentation ( source)
<?php
use Namespaced\UnknownClass;
function test(UndefinedClass $foo, UnknownClass $bar) {}
$param = new ReflectionParameter('test', 'foo');
$param2 = new ReflectionParameter('test', 'bar');
var_dump((string) $param);
var_dump((string) $param2);