The Solr extension allows you to communicate effectively with the Apache Solr Server in PHP.
The Solr extension is an extremely fast, light-weight, feature-rich library that allows PHP developers to communicate effectively with Solr server instances.
Versions 1.x of The PECL Extension supports Apache Solr Server 1.3-3.x
Versions 2.x of The PECL Extension supports Apache Solr Server 4.0+
There are built-in tools to add documents and make updates to the solr server.
It also contains tools that allows you to build advanced queries to the server when searching for documents.