Generates file.ddd.js/css filenames based on their mtime

TimebasedUrl.php

<?php

namespace proj\utils;

class TimebasedUrl
{
	static function js($path)
	{
		return '<script type="text/javascript" src="'.self::url($path).'"></script>';
	}

	static function css($path)
	{
		return '<link rel="stylesheet" href="'.self::url($path).'">';
	}

	static function url($relPath)
	{
		$domain = Web::protocolAgnostic(COOKIE_FREE_URL);
		$file = ROOT.$relPath;
		if (!file_exists($file) || !is_readable($file)
			|| !($ext = pathinfo($relPath, PATHINFO_EXTENSION))
			|| false === ($time = filemtime($file)))
			return $domain.$relPath;
		return $domain.preg_replace('|\.'.$ext.'$|is', '.'.$time.'.'.$ext, $relPath);
	}
}

Web::protocolAgnostic ?