register the names of the php functions you want to be able to call through xajax:
注册一个你想用xajax来调用的php函数名(与javascript中的函数名相对应 xajax_myfunction)
write the php functions you have registered and use the xajaxresponse object to return xml commands from them:
编写那个你刚刚已经注册的php函数,并从中用 xajaxresponse 对象来返回xml指令集