(PECL solr >= 0.9.2)
Represents a collection of name-value pairs sent to the Solr server during a request.
$frequency
   [, string $field_override
  ] )$fieldLength
   [, string $field_override
  ] )SolrQuery::ORDER_ASC
     Used to specify that the sorting should be in acending order
SolrQuery::ORDER_DESC
     Used to specify that the sorting should be in descending order
SolrQuery::FACET_SORT_INDEX
     Used to specify that the facet should sort by index
SolrQuery::FACET_SORT_COUNT
     Used to specify that the facet should sort by count
SolrQuery::TERMS_SORT_INDEX
     Used in the TermsComponent
SolrQuery::TERMS_SORT_COUNT
     Used in the TermsComponent