(PECL solr >= 0.9.2)
SolrQuery::addMltQueryField — Maps to mlt.qf
public SolrQuery::addMltQueryField ( string $field , float $boost ) : SolrQuery
Maps to mlt.qf. It is used to specify query fields and their boosts
field
The name of the field
boost
Its boost value
Returns the current SolrQuery object, if the return value is used.
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https://www.php.net/manual/en/solrquery.addmltqueryfield.php