函數（「___setSoapHeaders」）不是這個服務的有效方法

Question

你好，我正在嘗試使用Google adWords API，剛開始時我遇到了一個「無效方法」的問題，即使我下面一切正常（我相信）這是我的代碼：

ini_set("soap.wsdl_cache_enabled",0); 

class adwords { 

    protected $server = "###"; 
    protected $version = "###"; 
    protected $email = "###"; 
    protected $password = "###"; 
    protected $auth_key = "###"; 
    protected $dev_key = "###"; 
    protected $ua = "###"; 
    protected $client_id = ###; 

    public function __construct() { 
     $this->campaign_service(); 
    } 

    public function campaign_service() { 

     $service = "CampaignService"; 
     $options = array(
      'encoding' => 'utf-8', 
      'features' => SOAP_SINGLE_ELEMENT_ARRAYS 
     ); 
     $wsdl = "{$this->server}/{$this->version}/{$service}?wsdl"; 
     $namespace = "###"; 
     $header = array(
      'authToken' => $this->auth_key, 
      'clientCustomerId' => $this->client_id, 
      'userAgent' => $this->ua, 
      'developerToken' => $this->dev_key 
     ); 

     $client = new SoapClient($wsdl,$options); 
     $headers = new SoapHeader($namespace,"RequestHeader",$header,false); 
     $client->___setSoapHeaders($headers); 

    }   
} 

這是錯誤，我回去：

PHP致命錯誤：未捕獲的SOAPFault異常：[客戶]功能（「___setSoapHeaders」）不這項服務的有效方法

我錯過了什麼G？根據The PHP Manual這是一個有效的方法。更進一步，我嘗試搜索我能想到的一切，但找不到任何東西。任何幫助是極大的讚賞！順便說一句，我運行PHP 5.3.3。

Answer 1

__setSoapHeaders，只有兩個下劃線，而不是三個。