Create nested joins in apache solr with solarium. - This sample run with apache solr 4.x. - The nested querys is defined by the key _query_:" ... _query_:\" ... _query_:\" ... \" \" "

query-solr.php

<?php

 use \Solarium\Client as Client;

 $config = array(
   'endpoint' => array(
   'localhost' => array(
     'host' => '127.0.0.1',
     'port' => 8080,
     'path' => '/solr4/',
   )
 ));

 $client = new Client($config);

 $select = array();

 $select['query'] = 'bundle:a sm_field:string\ with\ spaces _query_:"{!join from=id to=parent} bundle:b _query_:\"{!join from=id to=parent}  bundle:c field_boolean:true  field_term:Start \"" ds_created:[2013-03-01T00:00:01Z TO 2013-03-31T23:59:59Z]';
 
 $select['fields'] = array('bundle','id');
 $select['start']  = 0;
 $select['rows']   = 100;

 $client->createSelect($select);
 $resultset = $client->select($query);

 echo 'NumFound: '.$resultset->getNumFound();

 foreach ($resultset as $document) {
   echo '<hr/><table>';
   foreach($document AS $field => $value) {
     if (is_array($value)) 
       $value = implode(', ', $value);
     echo '<tr><th>' . $field . '</th><td>' . $value . '</td></tr>';
   }
   echo '</table>';
 }