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(PECL solr >= 0.9.2)
SolrQuery::addSortField — Used to control how the results should be sorted
$field
[, int $order = SolrQuery::ORDER_DESC
] )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.