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<?php

$client = new SoapClient('http://www.webservicex.net/whois.asmx?WSDL');
$method = 'GetWhoIS';
$args = array('HostName' => 'reeze.cn');

var_dump($client->GetWhoIS(array('HostName' => 'reeze.cn')));

var_dump(call_user_func(array($client, $method), $args));

$reflectionMethod = new ReflectionMethod($client , $method);
var_dump($reflectionMethod->invokeArgs($client , $args));