Habari\Stack::add PHP Method

    public static function add($stack_name, $value, $value_name = null, $after = null)
    {
        $stack = self::get_named_stack($stack_name);
        if ($value_name == null && is_string($value)) {
            if ($test = StackItem::get($value)) {
                $value = $test;
            }
        }
        if (!$value instanceof StackItem) {
            $value_name = $value_name ? $value_name : md5(serialize($value));
            $value = StackItem::register($value_name, $value);
            foreach ((array) $after as $a) {
                $value->add_dependency($a);
            }
        }
        $stack[$value->name] = $value;
        self::$stacks[$stack_name] = $stack;
        return $stack;
    }