SolrClient::deleteByQuery Deletes all documents matching the given query &reftitle.description; public SolrUpdateResponseSolrClient::deleteByQuery stringquery Deletes all documents matching the given query. &reftitle.parameters; query The query &reftitle.returnvalues; Returns a SolrUpdateResponse on success and throws an exception on failure. &reftitle.errors; Throws SolrClientException if the client had failed, or there was a connection issue. Throws SolrServerException if the Solr Server had failed to process the request. &reftitle.examples; SOLR_SERVER_HOSTNAME, 'login' => SOLR_SERVER_USERNAME, 'password' => SOLR_SERVER_PASSWORD, 'port' => SOLR_SERVER_PORT, ); $client = new SolrClient($options); //This will erase the entire index $client->deleteByQuery("*:*"); $client->commit(); ?> ]]> &reftitle.seealso; SolrClient::deleteById SolrClient::deleteByIds SolrClient::deleteByQueries