Is there a free php search engine that doesn't use MySQL?

I've found several paid options and several options with PHP/MySQL, but does anyone know a free option for implemen开发者_如何学运维ting a site search option on my page that doesn't use a MySQL database?

If you want to programme the search functionality yourself and you're using PHP, then you could try the Lucene component that's in Zend Framework. It'll create a file-based index for you, so no MySQL, and you can use a variety of search syntax on it. The index file should also be compatible with the Java implementation of Lucene.

http://framework.zend.com/manual/en/zend.search.lucene.html

http://framework.zend.com/manual/en/learning.lucene.html