How to send select option and checkbox of a form in the form of xml to a php on form submit

How to send select option and checkbox of a form in the form of xml to a php on form submit

How to send select option (the value of the option retrieved from backend using $.ajax)
<select style="width:263.5px"; id="domain_login" >
and ckeckbox <input type="checkbox" id="check" class="checkbox"/>
of a form