PHP调用WebService

<?php try{$soap = new SoapClient("http://网址/服务名.asmx?wsdl"); 
/*给参数orderdata赋值*/ 
$contact = "参数值"; 
$params = array( "orderdata" => $contact, ); 

$result = $soap->服务方法名($params); 
PRint_r($result); 
} 

catch (Exception $e) { 
echo 'Caught exception: ', $e->getMessage(), "/n"; 
} 
?>