A purely PHP library for indexing and searching documents against an Apache Solr installation.
This project was formerly maintained at http://code.google.com/p/solr-php-client. Previous issues and downloads are still available for viewing there.
Try starting with the FAQ and Example Usage.
Also, feel free to search and ask questions on the google mailing list: php-solr-client@googlegroups.com / Group Page
Code is released under a 3-Clause BSD license, see COPYING for full text.