(PECL solr >= 2.2.0) Enable/Disable result grouping (group parameter)

(PECL sphinx >= 0.1.0) Set matches sorting mode

(PECL solr >= 2.2.0) Returns the expand query expand.q parameter

(PECL solr >= 2.2.0) Sets the field to collapse on

(PHP 4 >= 4.0.5, PHP 5 <= 5.0.5, PECL mnogosearch >= 1.0.0) Get mnoGoSearch API version

(PECL solr >= 0.9.2) Rollbacks all add/deletes made to the index since the last commit

(PECL solr >= 0.9.2) Returns more details on the HTTP status

(PECL solr >= 0.9.2) Determines the ordering of the facet field constraints

(PECL solr >= 0.9.2) Removes one of the stats.facet parameters

(No version information available, might only be in Git) Sets a Boost Function (bf parameter).