PHP:数组修改超出了foreach循环的范围

如何将新的键/值对添加到嵌套的foreach循环内的现有数组中,并使该对保持在循环范围之外？

" . $url . "
"; // works as expected

        $rss = fetch_rss($url); // from 'magpierss/rss_fetch.inc' above

        foreach ($rss->items as $item)
        {
            $item['feed_id'] = $feed_id;
            echo $item['feed_id'] . "
"; // works as expected
        }

        foreach ($rss->items as $item)
        {
            echo $item['feed_id'] . "
"; // nuthin..... 
        }
    }
?>

谢谢

如果我理解正确,你想要的是这个(对于第一个循环):

foreach ($rss->items as &$item) {

该&将$item是一个参考,你做任何更改将反映$rss->items