(PECL solr >= 0.9.2)
SolrQuery::getFacetPrefix — Returns the facet prefix
public SolrQuery::getFacetPrefix ([ string $field_override ] ) : string
Returns the facet prefix
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.getfacetprefix.php