(PECL solr >= 2.2.0) Returns the group.sort value

(PECL solr >= 2.2.0) Sets the initial size of the collapse data structures when collapsing on a numeric field

(PECL solr >= 2.2.0) Allows grouping results based on the unique values of a function query (group.func parameter)

(PECL solr >= 0.9.2) Drops all the fields in the document

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

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

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

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

(PECL solr >= 0.9.2) Flag to show debug information

(PECL solr >= 0.9.2) Returns a parameter value