(PECL solr >= 2.2.0) Selects the group heads by the max value of a numeric field or function query.

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

(PHP 4 >= 4.0.5, PHP 5 <= 5.0.5, PECL mnogosearch >= 1.0.0) Allocate mnoGoSearch session

(PHP 4 >= 4.0.6, PHP 5 <= 5.0.5, PECL mnogosearch >= 1.0.0) Get all the categories on the same level

(PECL sphinx >= 0.1.0) Update document attributes

(PECL solr >= 0.9.2) Custom serialization of SolrDocument objects

(PECL solr >= 0.9.2) Finalizes all add/deletes made to the index

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

(PECL sphinx >= 0.1.0) Escape special characters

(PECL swish >= 0.1.0) Set current seek pointer to the given position