What happens to an expression such as $doc->rss->channel->item->title when an item does not have a title (as is the case in at least one top-100 RSS feed)?
如果项没有标题（比如在 top-100 这样的 RSS 提要中），$doc->rss->channel->item->title 这样的表达式会怎么样呢？
2001-2009 Offering more than 100 lectures concerning Female Beauty and style and is known as "Doc. Cosmetic".
2009年超过100场大型女性美容及形象讲座历程，被时尚女性称之为“彩妆医生”。
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