https://www.php.net/manual/en/solrquery.getmltfields.php
PHP: SolrQuery::getMltFields - Manual
Returns all the fields to use for similarity
phpmanual
https://www.php.net/manual/ja/solrquery.getmltfields.php
PHP: SolrQuery::getMltFields - Manual
Returns all the fields to use for similarity
phpmanual
https://www.php.net/manual/de/solrquery.getmltfields.php
PHP: SolrQuery::getMltFields - Manual
Returns all the fields to use for similarity
phpmanual