XML to JSON, how to filter data

XML to JSON, how to filter data?
The XML below, want to convert to JSON
But the P-node requires only The data for these two nodes is not required for other data.
If you go directly with Json_encode, it's all data.
How can I convert to JSON, but as long as Data, how to get it?

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

-------XML---------

110171675
Tom
2013-08-19 00:02:00
46
24
74750
0
2013-08-19 00:02:00
Am

110171676
I'm a great beauty.
2013-08-19 01:15:00
46
24
74501
0
2013-08-19 01:15:00
Am

110171677
John doe
2013-08-19 02:09:00
46
24
64519
71411
2013-08-19 02:09:00
Am

JSON XML

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------Solution--------------------

$string = <<
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