Can I use Lucene with PHP ? I don't want to use Zend. Can I use in native PHP (not framework) ?
I would recommend using Apache SOLR as your Lucene backend and connecting via web service calls from your PHP code.
I'd also note that it's easy to pick and choose components of Zend Framework for use in your application without loading the entire framework. You could use Zend_Search_Lucene in your site and forego Zend's MVC, database, and related components.