SOAP-ERROR：解析WSDL：无法从“网站”加载无法加载外部实体

In Wamp server (locally) my code works, but in my web server on Centos 6 the script doesn't work. Why? I have read lot's of answers, but didn't find the solution.

Couldn't load from 'https://example.com/WEBService/SearchService.svc/wsdl?wsdl': failed to load external entity "https://example.com/WEBService/SearchService.svc/wsdl?wsdl"

private $_wsdl_uri = 'https://example.com/WEBService/SearchService.svc/wsdl?wsdl';   
private static $_soap_client = false;                                                    
private static $_inited = false;                                                         


public function init(&$errors)
{
  if(!self::$_inited)
  {
     try
     {
       if (self::$_soap_client = @new SoapClient($this->_wsdl_uri, array('soap_version' => SOAP_1_1)))
           self::$_inited = true;
     }
     catch (Exception $e)
     {
        $errors[] = 'Error here '.$e->getMessage();
        return false;
     }
  }
  return self::$_inited;
}

php -m | grep -i soap

soap

openssl installed.

In my webserver is installed php 5.6. In Wamp server (locally) php 5.3.

I disabled SSL certification, by passing context stream:

"stream_context" => stream_context_create(
    array(
        'ssl' => array(
            'verify_peer'       => false,
            'verify_peer_name'  => false,
        )
    )
)

So it works.

  private $_wsdl_uri = 'https://example.com/WEBService/SearchService.svc/wsdl?wsdl';   
private static $_soap_client = false;                                                    
private static $_inited = false;                                                         


public function init(&$errors)
{
  if(!self::$_inited)
  {
     try
        {
           if (self::$_soap_client = @new SoapClient($this->_wsdl_uri, array('soap_version' => SOAP_1_1, "stream_context" => stream_context_create(
            array(
                'ssl' => array(
                    'verify_peer'       => false,
                    'verify_peer_name'  => false,
                )
            )
        )
        )
        ))
               self::$_inited = true;
         }
     catch (Exception $e)
     {
        $errors[] = 'Error here '.$e->getMessage();
        return false;
     }
  }
  return self::$_inited;
}