(PECL solr >= 0.9.2)
SolrQuery::getMltCount — Returns the number of similar documents to return for each result
public SolrQuery::getMltCount ( ) : int
Returns the number of similar documents to return for each result
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.getmltcount.php