Laravel subdomain routing

routes.php

<?php

$host_array = array_reverse(explode('.', parse_url(url())['host']));
$domain = $host_array[1];
$tld = $host_array[0];
$host = $domain . '.' . $tld;

Route::group(['domain' => '{sub}.' . $host], function () {
	get('/', function($sub) {
		return 'Subdomain: ' . $sub;
	});
});