It's a port of Java Lucene to PHP
- Compatible with the Lucene index format
- Provides indexing and searching libraries
- Supports some of the lucene query language
- Support for indexing HTML documents: title, meta and body
- Has support for different field types:
- Keyword: Not tokenized
- UnIndexed: Not indexed
- Binary: Binary data
- Text: Tokenized
- UnStored: Tokenized, but only indexed