Site.php

<?php

class Site
{
    protected static $assets = array();

    public static function assets()
    {
        
        $arr = func_get_args();
        $level = ob_get_level();
        
        if (isset(static::$assets[$level])) {
            static::$assets[$level] += $arr;
        } else {
             static::$assets[$level] = $arr;
        }
        
    }
    
    public static function css()
    {
        krsort(static::$assets);
        Assets::add(array_values(static::$assets));
        return Assets::css();
    }
    
    public static function js()
    {
        krsort(static::$assets);
        Assets::add(array_values(static::$assets));
        return Assets::js();
    }
}