(PECL solr >= 0.9.2)
SolrQuery::setFacetPrefix — Specifies a string prefix with which to limits the terms on which to facet
public SolrQuery::setFacetPrefix ( string $prefix [, string $field_override ] ) : SolrQuery
Specifies a string prefix with which to limits the terms on which to facet.
prefix
The prefix string
field_override
The name of the field.
Returns the current SolrQuery object, if the return value is used.
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https://www.php.net/manual/en/solrquery.setfacetprefix.php