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SOAP is a Simple Object Access Protocol and it allows for a server to "talk" to a client over the internet once the client knows what functions (and the parameters attached to those functions) are present, this is exposed via the WSDL (Web Service Description Language). In PHP a way to generate the WSDL file on the file it is possible to do this with the Zend framework. (you can of course not use a WSDL and specify all of the function names and parameters by hand in the client, but I do not find that the best way of doing that unless you want to hide the server from other clients ?)
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