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Код

<?php
class API_Client {
 
    private static $instance = NULL;
     
    private function __construct() {
     
    }
     
    
    public static function getInstance() {
     
        if (!self::$instance) {
        
            $ns   = "auth";
            $wsdl = "http://site.ru/XmlGate.svc?singleWSDL";
             
            $auth->username = 'login';
            $auth->password = 'pass';
 
            $auth_vals    = new SoapVar($auth, SOAP_ENC_OBJECT);
 
            $authenticate = new SoapHeader($ns,'AuthInfo',$auth_vals, false);
             
            $client = new SoapClient($wsdl,array('cache_wsdl' => 0));
                                              
            $client->__setSoapHeaders(array($authenticate));
             
            self::$instance = $client;
        }
         
        return self::$instance;
    }
     
     
    private function __clone(){
         
    }
 
}
 
$data_1 = API_Client::getInstance()->GetHotelInformation('15523');
 
print_r($data_1);
?>