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

(PECL solr >= 2.2.0) Removes an expand filter query

(PECL solr >= 2.2.0) Overrides main filter query, determines which documents to include in the main group

(PECL solr >= 2.2.0) Returns group cache percent value

(PECL solr >= 0.9.2) Returns the text snippet generator for highlighted text

(PECL solr >= 0.9.2) Sets the frequency below which terms will be ignored in the source docs

(PECL solr >= 0.9.2) Toggles the echoHandler parameter

(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) Flag to show debug information

(PECL solr >= 2.2.0) If true, Solr includes the number of groups that have matched the query in the results