There are many ways to connect using PHP, but the most common way is to use SoapClient, many online resources are availibleavailable!
We created a sample project that uses a generated class library from You can use http://www.stccorp.net/ewsdl2php/
Download project here
to generate a class library from the WSDL or use a simpler approach as shown in the following code example.
Sample is not created by a PHP Professional, but should give developer a good starting point.