(PECL solr >= 2.2.0)
SolrQuery::addGroupQuery — Allows grouping of documents that match the given query
public SolrQuery::addGroupQuery ( string $value ) : SolrQuery
Allows grouping of documents that match the given query. Adds query to the group.query parameter
value
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https://www.php.net/manual/en/solrquery.addgroupquery.php