(PECL solr >= 0.9.2)
SolrClient::deleteByQuery — Deletes all documents matching the given query
public SolrClient::deleteByQuery ( string $query ) : SolrUpdateResponse
Deletes all documents matching the given query.
query
The query
Returns a SolrUpdateResponse on success and throws an exception on failure.
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.
Example #1 SolrQuery::deleteByQuery() example
<?php
$options = array
(
'hostname' => 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();
?>
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https://www.php.net/manual/en/solrclient.deletebyquery.php