为什么twitter的状态->内容，即时间线被奇怪地保存到mysql中?

My app saves tweets into mysql. But the contents of '$status->content' i.e. tweet message are not saved as they appear if outputted. Other values like '?->author->name' and '?->id' are saved as they appear. This is how a tweet msg i.e. '$status->content' look like when I display tables results;My app saves tweets into mysql. But the content