可能捕获PHP回显输出?

所以我有一个功能，例如:

So I have a function such as:

public static function UnorderedList($items, $field, $view = false){
    if(count($items) > 0){
        echo '<ul>';
        foreach($items as $item){
            echo '<li>';
            if($view){
                echo '<a href="'.$view.'id='.$item->sys_id.'" title="View Item">'.$item->$field.'</a>';
            }else{
                echo $item->$field;
            }   
            echo '</li>';
        }
        echo '</ul>'; 
    }else{
        echo '<p>No Items...</p>';
    }
}

此函数循环显示某些项目并呈现无序列表.我想知道的是，如果我愿意的话，是否有可能捕获回声输出.

This function loops over some items and renders a unordered list. What I am wondering is if its possible to capture the echo output if I wish.

我通过做类似的事情来调用使用此功能:

I make a call to use this function by doing something like:

Render::UnorderedList(Class::getItems(), Class::getFields(), true); 

这会将无序列表转储到我的页面上.我知道我可以将echo更改为变量并返回该变量，但是我只是好奇是否可以在不修改该函数的情况下捕获echo输出，而只是以某种方式修改对该函数的调用?

And this will dump a unordered list onto my page. I Know I can just change echo to a variable and return the variable but I was just curious if its possible to capture echo output without modifying that function, merely modifying the call to the function in some way?

谢谢！