(PECL solr >= 0.9.2)
SolrDocument::sort — Sorts the fields in the document
$sortOrderBy, int $sortDirection = SolrDocument::SORT_ASC): bool
The fields are rearranged according to the specified criteria and sort direction Fields can be sorted by boost values, field names and number of values. The sortOrderBy parameter must be one of : * SolrDocument::SORT_FIELD_NAME * SolrDocument::SORT_FIELD_BOOST_VALUE * SolrDocument::SORT_FIELD_VALUE_COUNT The sortDirection can be one of : * SolrDocument::SORT_DEFAULT * SolrDocument::SORT_ASC * SolrDocument::SORT_DESC The default way is to sort in ascending order.
sortOrderByThe sort criteria.
sortDirectionThe sort direction.
成功时返回 true， 或者在失败时返回 false。