Neos\Cache\Backend\TaggableBackendInterface::findIdentifiersByTag PHP Method

Finds and returns all cache entry identifiers which are tagged by the specified tag.

public findIdentifiersByTag ( string $tag ) : array
$tag	string	The tag to search for
return	array	An array with identifiers of all matching entries. An empty array if no entries matched

    public function findIdentifiersByTag($tag);

TaggableBackendInterface