[PHP] Search Engine With Boolean Support <--Please help

[SpamSucks86]

I need to have an internal search engine for my site. It needs to
support Boolean (not, or, and). Are there any fairly simple scripts out
there that will help me with this? Even if it's just to give me an idea
of where to start. I'm using mySQL, and Boolean support isn't
implemented until v4.0. Thanks for any and all help! =)