Java 在PHP中读取post方法的数据

我向PHP服务器请求如下代码片段

StringEntity stringEntity = new StringEntity(myString, "UTF-8"); 
httppost.setEntity(stringEntity);
httppost.addHeader("Accept", "application/xml");
httppost.addHeader("Content-Type", "application/xml");

现在我想将xml数据读入PHP服务器

我怎么能看出来

$xmlstr= file_get_contents('php://input');
$xml = new SimpleXMLElement($xmlstr);
var_dump($xml )