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xml转json,如何筛选数据

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Release： 2016-06-13 12:39:11
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xml转json,怎么筛选数据？
下边的xml，想转为json
但P节点下只需要这两个节点的数据，其他数据不需要。
如果直接用json_encode转出来，是所有的数据
请问怎么能转为json,但只要的数据，怎么弄？

例如
{"PN":"\u7b2c\u4e00\u5468\u64ad\u5267\u573a\uff1a\u8ffd\u9c7c\u4f20\u5947 31","PT":"2013-08-19 22:01:00"}

-------xml---------


  


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    张三
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    110171676
    我是大美人
    2013-08-19 01:15:00
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    李四
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