A vb+php+nusoap problem of garbled

The encoding within the problem nusoap is changed to GB2312 after response xml:
http/1.1 Internal Server Error
Date:thu, Sep 04:15:03 GMT
Server:apache/1.3.29 (Unix) php/4.3.4
x-powered-by:php/4.3.4
set-cookie:phpsessid=b35fd0ac5381c048a5dc1a602fd66605; path=/
Expires:thu, Nov 1981 08:52:00 GMT
Cache-control:no-store, No-cache, Must-revalidate, post-check=0, pre-check=0
Pragma:no-cache
X-accelerated-by:phpa/1.3.3r2
status:500 Internal Server Error
x-soap-server:nusoap/0.6.6 (1.70)
content-length:709
Connection:close
Content-type:text/xml; charset=gb2312

<?xml version= "1.0" encoding= "GB2312" ><soap-env:envelope soap-env:encodingstyle= "http://" schemas.xmlsoap.org/soap/encoding/"
xmlns:soap-env= "http://schemas.xmlsoap.org/soap/envelope/"
Xmlns:xsd= "Http://www.w3.org/2001/XMLSchema"
Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"
Xmlns:soap-enc= "http://schemas.xmlsoap.org/soap/encoding/"
xmlns:si= "Http://soapinterop.org/xsd" >
<soap-env:body><soap-env:fault><faultcode>server</faultcode><faultactor></ Faultactor><faultstring>error in MSG parsing:
XML Error parsing SOAP payload on line 1:not well-formed (invalid token) </faultstring><detail><soapval xsi : type= "xsd:string" ></soapval></detail></soap-env:fault></soap-env:body></ Soap-env:envelope>