Type hinting in PHP variadics

variadics.php

<?php

class Bar{}
$bars = [new Bar, new Bar, new Bar];
$ints = [1, 2, 3];

//  without variadics
// lots of manual type checking
function oldFoo($bars)
{
    foreach ($bars as $bar) {
        if (!$bar instanceof Bar) {
			throw new InvalidArgumentException("Must be a Bar.");
        }
    }
	echo "Got " . count($bars) . " bars.\n";
}

// php 5.6 style
// just look at this lovely type checking!
function foo(Bar ...$bars)
{
	echo "Got " . count($bars) . " bars.\n";
}

foo(...$bars);

// fatal error
foo(...$ints);



oldFoo($bars);

// InvalidArgumentException 
oldFoo($ints);