(PECL solr >= 0.9.2)
SolrQuery::setMltCount — Set the number of similar documents to return for each result
public SolrQuery::setMltCount ( int $count ) : SolrQuery
Set the number of similar documents to return for each result
count
The number of similar documents to return for each result
Returns the current SolrQuery object, if the return value is used.
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https://www.php.net/manual/en/solrquery.setmltcount.php