(PECL solr >= 0.9.2)
SolrQuery::setFacetMissing — Maps to facet.missing
public SolrQuery::setFacetMissing ( bool $flag [, string $field_override ] ) : SolrQuery
Used to indicate that in addition to the Term-based constraints of a facet field, a count of all matching results which have no value for the field should be computed
flag
true turns this feature on. false disables it.
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.setfacetmissing.php