Sending an XML request using PHP and SOAP 1.2

Hi all,

I have a website on a Business Catalyst server and I would like to use their API.

https://help.worldsecuresystems.com/catalystwebservice/catalystcrmwebservice.asmx
https://help.worldsecuresystems.com/catalystwebservice/catalystcrmwebservice.asmx?op=Case_Retrieve

They have instructed me that I need to send the following XML request (please see attached code) to their servers in order to retrieve the information I want.

How do I go about doing this with PHP?? Can someone point me in the right direction to some tutorials/guides/examples.

Thanks,

GW.

POST /catalystwebservice/catalystcrmwebservice.asmx HTTP/1.1
Host: help.worldsecuresystems.com
Content-Type: application/soap+xml; charset=utf-8
Content-Length: length 
<?xml version="1.0" encoding="utf-8"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
  <soap12:Body>
    <Case_Retrieve xmlns="http://tempuri.org/CatalystDeveloperService/CatalystCRMWebservice">
      <username>Username</username>
      <password>Password</password>
      <siteId>12345</siteId>
      <caseId>67890</caseId>
    </Case_Retrieve>
  </soap12:Body>
</soap12:Envelope>

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