Are you asking for a tool to directly convert your C# code to PHP? I doubt there is one available and I'd be a little worried about using one (from what I've learnt of C# it's not easily transferrable to PHP).
Depending on the size of the project I'd be much more inclined to rewrite it. I did have a look but couldn't find anything (lots and lots of job requests though - looks like a business there =P).
