router.php

<?php

if (!isResource()) {
	return false;
}

require_once __DIR__ . '/index.php';

function isResource() {
	$path = $_SERVER['SCRIPT_NAME'];
	$parts = explode('.', $path);
	if (empty($parts)) {
		return true;
	}
	$type = end($parts);
	if ($type === 'php') {
		return true;
	}
	if (in_array($type, ['yml', 'db', 'twig', 'md'])) {
		// Fix PHP built-in server
		$_SERVER['SCRIPT_FILENAME'] = __FILE__;
		$_SERVER['SCRIPT_NAME'] = '/index.php';
		$_SERVER['PHP_SELF'] = '/index.php';
		return true;
	}

	if ($type === 'map') {
		return false;
	}

	if (!file_exists(__DIR__ . $path)) {
		return true;
	}

	return false;
}