<?php
$options = array
(
'hostname' => SOLR_SERVER_HOSTNAME,
'login' => SOLR_SERVER_USERNAME,
'password' => SOLR_SERVER_PASSWORD,
'port' => SOLR_SERVER_PORT,
);
$client = new SolrClient($options);
$query = new SolrQuery();
$query->setQuery('*:*');
$query->addFilterQuery('color:blue,green');
$query_response = $client->query($query);
$response = $query_response->getResponse();
print_r($response['facet_counts']['facet_fields']);
?>
The above example will output
something similar to: