The facet class supports the Solr pivot facet: https://solr.apache.org/guide/faceting.html#pivot-decision-tree-faceting.

Options

The options below can be set as query option values, but also by using the set/get methods. See the API docs for all available methods.

Name	Type	Default value	Description
fields	string	null	Fields to pivot on, separated by commas.
pivot.mincount	int	null	Minimum number of documents that need to match in order for the facet to be included in results.
limit	int	null	Limit the facet counts.
offset	int	null	Show facet count starting from this offset.
sort	string	null	Sort order (sorted by count or index). Use one of the class constants.
overrequest.count	int	null	Change the amount of over-requesting Solr does.
overrequest.ratio	float	null	Change the amount of over-requesting Solr does.

Example

<?php

require_once(__DIR__.'/init.php');
htmlHeader();

// create a client instance
$client = new Solarium\Client($adapter, $eventDispatcher, $config);

// get a select query instance
$query = $client->createSelect();

// get the facetset component
$facetSet = $query->getFacetSet();

// create two facet pivot instances
$facet = $facetSet->createFacetPivot('cat-popularity-instock');
$facet->addFields('cat,popularity,inStock');
$facet->setMinCount(0);

$facet = $facetSet->createFacetPivot('popularity-cat');
$facet->addFields('popularity,cat');

// this executes the query and returns the result
$resultset = $client->select($query);

// display the total number of documents found by Solr
echo 'NumFound: '.$resultset->getNumFound();

// display facet results
$facetResult = $resultset->getFacetSet()->getFacet('cat-popularity-instock');
echo '<h3>cat &raquo; popularity &raquo; instock</h3>';
foreach ($facetResult as $pivot) {
    displayPivotFacet($pivot);
}

$facetResult = $resultset->getFacetSet()->getFacet('popularity-cat');
echo '<h3>popularity &raquo; cat</h3>';
foreach ($facetResult as $pivot) {
    displayPivotFacet($pivot);
}

htmlFooter();


/**
 * Recursively render pivot facets
 *
 * @param $pivot
 */
function displayPivotFacet($pivot)
{
    echo '<ul>';
    echo '<li>Field: '.$pivot->getField().'</li>';
    echo '<li>Value: '.$pivot->getValue().'</li>';
    echo '<li>Count: '.$pivot->getCount().'</li>';
    foreach ($pivot->getPivot() as $nextPivot) {
        displayPivotFacet($nextPivot);
    }
    echo '</ul>';
}