Sphinx Full Text Search Engine
For a very long time, I was convinced that a FULLTEXT index in MySQL was the best solution for all your searching needs. Then I realized that it was horribly slow, and mixing with complex joins completely destroyed any chances of using MySQL indexes in any way that would make sense or get decent results. The solution to fast and scalable free text search on any website is, of course, a Full Text search engine.
There are a few different ones out there. After a brief affair with Lucene, I settled on Sphinx. Sphinx is easy to install, even on 64-bit machines, and is architected in a way that makes a lot of sense for the web. The following steps were performed on a Red Hat machine. Don’t skip the mysql-dev install, even if you already MySQL installed.
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Once installed, it’s fairly simple to start playing with the packaged example data and queries. The php APIs make integration easy, either to build a service, or use locally as a substitute for MySQL. In fact, as long as the index can be kept reasonably up to date, Sphinx is a better choice for complicated sorts than MySQL.