Function parameters
-----
<?php

function test($a, &$b, Type $c, Type &$c, Type &... $d) {}
function test(... $foo) {}
function test(Type ... $foo) {}
function test(&... $foo) {}
-----
function test($a, &$b, Type $c, Type &$c, Type &... $d)
{
}
function test(... $foo)
{
}
function test(Type ... $foo)
{
}
function test(&... $foo)
{
}