$attributes = array(
                    'Double_Opt_in'      => true,
                    'Double_Opt_in_Date' => date('d.m.Y h:m'),
                    'Double_Opt_in_IP'   => $_SERVER['REMOTE_ADDR'],
                    'Checkin_opt_in'     => true,
                    'Country_Code'       => '',
                    'Language'           => ''
                );
    $client = new ExactTargetSoapClient("$wsdl", array('trace' => 1));
            $client->username = "$username";
            $client->password = "$password";

            $subscriber = new ExactTarget_Subscriber();
            $subscriber->EmailAddress = $email;
            $subscriber->SubscriberKey = $email;

        $Double_Opt_in      = new ExactTarget_Attribute();
                $Double_Opt_in->Name = "Double_Opt_in";
                $Double_Opt_in->Value = 'true';

                $Double_Opt_in_Date = new ExactTarget_Attribute();
                $Double_Opt_in_Date->Name = "Double_Opt_in_Date";
                $Double_Opt_in_Date->Value = date('m.d.Y h:i');

                $Double_Opt_in_IP   = new ExactTarget_Attribute();
                $Double_Opt_in_IP->Name = "Double_Opt_in_IP";
                $Double_Opt_in_IP->Value = $_SERVER['REMOTE_ADDR'];

$subscriber->Attributes = array(
                    $Double_Opt_in,
                    $Double_Opt_in_Date,
                    $Double_Opt_in_IP,
                    );
$subscriber->Lists = array();
$list->ID = "123456";
$subscriber->Lists[] = $list;

        $so = new ExactTarget_SaveOption();
        $so->PropertyName = "*";
        $so->SaveAction = ExactTarget_SaveAction::UpdateAdd;
        $soe = new SoapVar($so, SOAP_ENC_OBJECT, 'SaveOption', "http://exacttarget.com/wsdl/partnerAPI");
        $opts = new ExactTarget_UpdateOptions();
        $opts->SaveOptions = array($soe);

        $object = new SoapVar($subscriber, SOAP_ENC_OBJECT, 'Subscriber', "http://exacttarget.com/wsdl/partnerAPI");

        $request = new ExactTarget_CreateRequest();
        $request->Options = $opts;
        $request->Objects = array($object);

        $results = $client->Create($request);
        write_log($results);