I guess no one really interfaces directly with TokyoCabinet from PHP. For most cases, TokyoTyrant is probably more appropriate.

If you do need to though, check out http://code.google.com/p/1bacode/source/browse/trunk/front-end/extension/?r=12#extension/tokyocabinet.

Works great, and was surprisingly hard to find.

See my other post for help compiling the PHP extension.