使用simpleXML在php中解析远程xml

I have the following xml

我有以下xml

<rss>
<channel>   
<item><title><![CDATA[bla]]></title><description><![CDATA[desc1]]></description><link>blah</link></item>
<item><title><![CDATA[bleh]]></title><description><![CDATA[desc2]]></description><link>blahhh</link></item>
</rss>
</channel>  
<rss>
<cha