(PECL solr >= 0.9.2)
SolrQuery::getMltQueryFields — Returns the query fields and their boosts
public SolrQuery::getMltQueryFields ( ) : array
Returns the query fields and their boosts
This function has no parameters.
Returns an array on success and null if not set.
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https://www.php.net/manual/en/solrquery.getmltqueryfields.php