$soapclient = new soapclient("http://shippingapi.ebay.cn/production/v2/orderservice.asmx?wsdl");

$params = array(
    'Version' => "2.0.0",
    'APIDevUserID' => "sureelectronics",
    'APIPassword' => "7114209N1OCBA61N83CRA0PY1F743DSGTM7GEAY581CND3BHG0POUW20111540",
    'APISellerUserID' => "sureelectronics",
    'MessageID' => "125625622452",    
    'TrackCode' => "LK042013892CN"    
);






$functions = $soapclient->CancelAPACShippingPackage($params);



print_r($functions);
<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:ship="http://shippingapi.pushauction.net/">
   <soap:Header/>
   <soap:Body>
      <ship:CancelAPACShippingPackage>
         <ship:CancelAPACShippingPackageRequest>
            <ship:Version>2.0.0</ship:Version>
            <ship:APIDevUserID>****</ship:APIDevUserID>
            <ship:APIPassword>********</ship:APIPassword>
            <ship:APISellerUserID>*******</ship:APISellerUserID>
            <ship:MessageID>1234</ship:MessageID>
            <ship:TrackCode>LK*********CN</ship:TrackCode>
         </ship:CancelAPACShippingPackageRequest>
      </ship:CancelAPACShippingPackage>
   </soap:Body>
</soap:Envelope>

$soapclient = new soapclient("http://shippingapi.ebay.cn/production/v2/orderservice.asmx?wsdl");

$params = array(
    'Version' => "2.0.0",
    'APIDevUserID' => "sureelectronics",
    'APIPassword' => "7114209N1OCBA61N83CRA0PY1F743DSGTM7GEAY581CND3BHG0POUW20111540",
    'APISellerUserID' => "sureelectronics",
    'MessageID' => "125625622452",    
    'TrackCode' => "LK042013892CN"    
);

$functions = $soapclient->CancelAPACShippingPackage(array("CancelAPACShippingPackageRequest"=>$params));
print_r( $functions);