(PECL solr >= 0.9.2)
SolrQuery::getMltMinDocFrequency — Returns the treshold frequency at which words will be ignored which do not occur in at least this many docs
public SolrQuery::getMltMinDocFrequency ( ) : int
Returns the treshold frequency at which words will be ignored which do not occur in at least this many docs
This function has no parameters.
Returns an integer on success and null if not set.
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https://www.php.net/manual/en/solrquery.getmltmindocfrequency.php