(PECL solr >= 0.9.2)
SolrClient::rollback — Rollbacks all add/deletes made to the index since the last commit
public SolrClient::rollback ( ) : SolrUpdateResponse
Rollbacks all add/deletes made to the index since the last commit. It neither calls any event listeners nor creates a new searcher.
This function has no parameters.
Returns a SolrUpdateResponse on success or throws a SolrClientException on failure.
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https://www.php.net/manual/en/solrclient.rollback.php