php simplexmlElement操作xml的命名空间实现代码

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看了这个问题，第一个反应就是namespace的关系，但我从来没有使用simplexml操作过namespace，于是就翻开手册查了一下资料，问题并没有解决，最终是通过google解决了该问题。

提问题的朋友贴出了数据源，来自于：http://code.google.com/intl/zh-CN/apis/contacts/docs/3.0/developers_guide_protocol.html#retrieving_without_query，数据结构大致如下：
复制代码 代码如下:
<feed xmlns=''http://www.w3.org/2005/Atom'' xmlns:openSearch=''http://a9.com/-/spec/opensearch/1.1/'' xmlns:gContact=''http://schemas.google.com/contact/2008'' xmlns:batch=''http://schemas.google.com/gdata/batch'' xmlns:gd=''http://schemas.google.com/g/2005'' gd:etag=''W/"CUMBRHo_fip7ImA9WxRbGU0."''>
<id>liz@gmail.com</id>
<updated>2008-12-10T10:04:15.446Z</updated>
<category scheme=''http://schemas.google.com/g/2005#kind'' term=''http://schemas.google.com/contact/2008#contact'' />
<title>Elizabeth Bennet''s Contacts</title>
<link rel=''http://schemas.google.com/g/2005#feed'' type=''application/atom+xml'' href=''https://www.google.com/m8/feeds/contacts/liz%40gmail.com/full'' />
<link rel=''http://schemas.google.com/g/2005#post'' type=''application/atom+xml'' href=''https://www.google.com/m8/feeds/contacts/liz%40gmail.com/full'' />
<link rel=''http://schemas.google.com/g/2005#batch'' type=''application/atom+xml'' href=''https://www.google.com/m8/feeds/contacts/liz%40gmail.com/full/batch'' />
<link rel=''self'' type=''application/atom+xml'' href=''https://www.google.com/m8/feeds/contacts/liz%40gmail.com/full?max-results=25'' />
<author>
<name>Elizabeth Bennet</name>
<email>liz@gmail.com</email>
</author>
<generator version=''1.0'' uri=''http://www.google.com/m8/feeds''> Contacts </generator>
<openSearch:totalResults>1</openSearch:totalResults>
<openSearch:startIndex>1</openSearch:startIndex>
<openSearch:itemsPerPage>25</openSearch:itemsPerPage>
<entry gd:etag=''"Qn04eTVSLyp7ImA9WxRbGEUORAQ."''>
<id> http://www.google.com/m8/feeds/contacts/liz%40gmail.com/base/c9012de </id>
<updated>2008-12-10T04:45:03.331Z</updated>
<app:edited xmlns:app=''http://www.w3.org/2007/app''>2008-12-10T04:45:03.331Z</app:edited>
<category scheme=''http://schemas.google.com/g/2005#kind'' term=''http://schemas.google.com/contact/2008#contact'' />
<title>Fitzwilliam Darcy</title>
<gd:name>
<gd:fullName>Fitzwilliam Darcy</gd:fullName>
</gd:name>
<link rel=''http://schemas.google.com/contacts/2008/rel#photo'' type=''image/*'' href=''https://www.google.com/m8/feeds/photos/media/liz%40gmail.com/c9012de'' gd:etag=''"KTlcZWs1bCp7ImBBPV43VUV4LXEZCXERZAc."'' />
<link rel=''self'' type=''application/atom+xml'' href=''https://www.google.com/m8/feeds/contacts/liz%40gmail.com/full/c9012de'' />
<link rel=''edit'' type=''application/atom+xml'' href=''https://www.google.com/m8/feeds/contacts/liz%40