PHP library for native GWT RPC

I can't find solution for parsing GWT RPC request with PHP. Request has strange format. I need find specifications for that format (parsing and expected response) or working server-side PHP library.

Sample of GWT request:

5|0|5|http://tracker/g开发者_JAVA百科wt/war/trackingsystem/|6F50E78F07D452C741455B0CA20F764D|client.rpc.RPCApiInterface|getIssue|I|1|2|3|4|1|5|12|

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Sources for this example are here GWTPHP-Helloworld. (http://sourceforge.net/project/showfiles.php?group_id=207256)