(PECL solr >= 2.2.0)
SolrQuery::setExpandRows — Sets the number of rows to display in each group (expand.rows). Server Default 5
public SolrQuery::setExpandRows ( int $value ) : SolrQuery
Sets the number of rows to display in each group (expand.rows). Server Default 5
value
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    https://www.php.net/manual/en/solrquery.setexpandrows.php