php获取通过http协议post提交过来xml数据及解析xml

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php 如何获取请求的xml数据,对方通过http协议post提交过来xml数据，php如何获取到这些数据呢？
复制代码 代码如下:
<?php
$xml_data =''<AATAvailReq1>''.
''<Agency>''.
''<Iata>1234567890</Iata>''.
''<Agent>lgsoftwares</Agent>''.
''<Password>mypassword</Password>''.
''<Brand>phpmind.com</Brand>''.
''</Agency>''.
''<Passengers>''.
''<Adult AGE="" ID="1"></Adult>''.
''<Adult AGE="" ID="2"></Adult>''.
''</Passengers>''.
''<HotelAvailReq1>''.
''<DestCode>JHM</DestCode>''.
''<HotelCode>OGGSHE</HotelCode>''.
''<CheckInDate>101009</CheckInDate>''.
''<CheckOutDate>101509</CheckOutDate>''.
''<UseField>1</UseField>''.
''</HotelAvailReq1>''.
''</AATAvailReq1>'';
$URL = "https://www.yourwebserver.com/path/";
$ch = curl_init($URL);
curl_setopt($ch, CURLOPT_MUTE, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(''Content-Type: text/xml''));
curl_setopt($ch, CURLOPT_POSTFIELDS, "$xml_data");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($ch);
curl_close($ch);
?>