(PECL solr >= 0.9.2)
SolrQuery::getFacetMethod — Returns the value of the facet.method parameter
public SolrQuery::getFacetMethod ([ string $field_override ] ) : string
Returns the value of the facet.method parameter. This accepts an optional field override.
field_override
The name of the field
 Returns a string on success and null if not set 
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    https://www.php.net/manual/en/solrquery.getfacetmethod.php