How to use MODIFIED HEADER in Soap Request

I have to make soap request to TimeTec Api.
1- First login works using Soap Request Activity. I receive a Security-Token

2- In following Soap Requests i HAVE to use this Security-Token in Soap request Header. How do i do that?

For PHP there is example available from TimeTec…if this can be of any help to understand the problem.

FROM API DOCUMENTATION :
SecurityToken Used for authentication for subsequent function.
Need to put in SoapHeader when call subsequent function from web service.

Eg (PHP).

$auth = array( ‘SecurityToken’=>$this->getSecurityToken());
$header = new SoapHeader($this->namespace,‘WebServiceSoapHeader’,$auth,false);

Thank you in advance !