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