Since i am working with a lot of soap services right now i searched for a tool that generates the soap classes for me. Thankts to propel and its "schema.xml" i am getting really lazy for doing such a task by hand ;-). Fortunately, the internet is still a place where everything can be found, so the search engine of my choice scores and found the wsdl2phpgenerator provided by walle.
Simple WSDL to PHP classes converter. Takes a wsdl file and outputs class files ready to use. Uses the MIT licence (http://www.opensource.org/licenses/mit-license.php) Usage executable: ./wsdl2php -i input.wsdl -o /tmp/my/directory/wsdlJust add -v to use the verbose mode and -n my\\namespace to add a preferred namespace.