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(PECL solr >= 2.2.0)
SolrCollapseFunction::setMax — Selects the group heads by the max value of a numeric field or function query.
$max
)Selects the group heads by the max value of a numeric field or function query.
max
SolrCollapseFunction
Example #1 SolrCollapseFunction::setMax() example
<?php
$func = new SolrCollapseFunction ( 'field_name' );
$func -> setMax ( 'sum(cscore(),field(some_field))' );
$query = new SolrQuery ( '*:*' );
$query -> collapse ( $func );
?>