(PECL solr >= 0.9.2) Retrieves a field by name

(PECL solr >= 0.9.2) Returns an array of non URL-encoded parameters

(PECL solr >= 2.2.0) Add a field to be used to group results.

(PECL solr >= 2.2.0) Returns true if grouping is enabled

(PECL solr >= 2.2.0) Specifies the number of results to return for each group. The server default value is

(PECL solr >= 0.9.2) Returns the current version of the Solr extension

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