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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 );
 ?>