<?php

class WsseAuthHeader extends SoapHeader {
    private $wss_ns = 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd';

    function __construct($user, $pass, $ns = null) {
        if ($ns) {
            $this->wss_ns = $ns;
        }

        $auth = new stdClass();
        $auth->Username = new SoapVar($user, XSD_STRING, NULL, $this->wss_ns, NULL, $this->wss_ns);
        $auth->Password = new SoapVar($pass, XSD_STRING, NULL, $this->wss_ns, NULL, $this->wss_ns);

        $username_token = new stdClass();
        $username_token->UsernameToken = new SoapVar($auth, SOAP_ENC_OBJECT, NULL, $this->wss_ns, 'UsernameToken', $this->wss_ns);

        $security_sv = new SoapVar(
                new SoapVar($username_token, SOAP_ENC_OBJECT, NULL, $this->wss_ns, 'UsernameToken', $this->wss_ns), SOAP_ENC_OBJECT, NULL, $this->wss_ns, 'Security', $this->wss_ns);
        parent::__construct($this->wss_ns, 'Security', $security_sv, true);
    }

}

$username = 'login';
$password = 'pass';
$wsdl = 'url';

$wsse_header = new WsseAuthHeader($username, $password);

$client = new SoapClient($wsdl, array(
    "trace" => 0,
    'soap_version' => SOAP_1_2,
    "exceptions" => 0,
        )
);

$client->__setSoapHeaders(array($wsse_header));