$html = 'HTTP/1.1 200 OK Cache-Control: private, max-age=0 Content-Type: text/xml; charset=utf-8 Server: Microsoft-IIS/7.0 X-AspNet-Version: 4.0.30319 X-Powered-By: ASP.NET Date: Mon, 22 Oct 2012 07:38:15 GMT Connection: close Content-Length: 315 <?xml version="1.0" encoding="utf-8"?> <CSubmitState xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://tempuri.org/"> <State>0</State> <MsgID>11022153815002472</MsgID> <MsgState>提交成功</MsgState> <Reserve>0</Reserve> </CSubmitState>';如上..怎么把 $html 中的 字符串  和 xml 分离出来呢?~~~用的是 php 语言求大仙..拯救~~~