(PECL solr >= 2.2.0)
SolrQuery::setExpandQuery — Sets the expand.q parameter
public SolrQuery::setExpandQuery ( string $q ) : SolrQuery
Sets the expand.q parameter.
Overrides the main q parameter, determines which documents to include in the main group.
q
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https://www.php.net/manual/en/solrquery.setexpandquery.php