(PECL solr >= 0.9.2)
SolrQuery::getFacetSort — Returns the facet sort type
public SolrQuery::getFacetSort ([ string $field_override ] ) : int
Returns an integer (SolrQuery::FACET_SORT_INDEX or SolrQuery::FACET_SORT_COUNT)
field_override
The name of the field
Returns an integer (SolrQuery::FACET_SORT_INDEX or SolrQuery::FACET_SORT_COUNT) on success or null if not set.
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https://www.php.net/manual/en/solrquery.getfacetsort.php