How to generate SOAP header in PHP?

How to generate SOAP header in PHP?

I a new to SOAP. How can I generate SOAP header like the one below ?
<SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
<SOAP-ENV:Header>
<t:Transaction xmlns:t="xxs">
<tc>
<iden u="Test" p="TEMP001" city="code" role="Agent" />
<agent user="user1" />
<trace>trace001</trace>
<script name="test" />
</tc>
</t:Transaction>
</SOAP-ENV:Header>
</SOAP-ENV:Envelope>