(PECL solr >= 0.9.2)
SolrQuery::getFacetFields — Returns all the facet fields
public SolrQuery::getFacetFields ( ) : array
Returns all the facet fields
This function has no parameters.
Returns an array of all the fields and null if none was set
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https://www.php.net/manual/en/solrquery.getfacetfields.php