(PECL solr >= 0.9.2)
SolrQuery::addSortField — Used to control how the results should be sorted
public SolrQuery::addSortField ( string $field [, int $order = SolrQuery::ORDER_DESC ] ) : SolrQuery
Used to control how the results should be sorted.
field
The name of the field
order
The sort direction. This should be either SolrQuery::ORDER_ASC or SolrQuery::ORDER_DESC.
Returns the current SolrQuery object.
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https://www.php.net/manual/en/solrquery.addsortfield.php