how to generate a soap request in php from this xml

I've got this xml. how to connect via php on service url : http://ift.tt/1wQKibl

<?xml version="1.0" encoding="utf-8" ?>
<PlaceSearchRequest>
    <Username>SERUNCD</Username>
    <Password>TA78UNC</Password>
    <PlaceType>Cities</PlaceType>
    <Language>en</Language>
</PlaceSearchRequest>

documentation to link located on this link http://ift.tt/1t0rq3w