(PECL solr >= 0.9.2)
SolrQuery::getFacetSort — Returns the facet sort type
$field_override
] ) : intReturns an integer (SolrQuery::FACET_SORT_INDEX or SolrQuery::FACET_SORT_COUNT)
field_overrideThe name of the field
Returns an integer (SolrQuery::FACET_SORT_INDEX or SolrQuery::FACET_SORT_COUNT) on success or NULL if not set.