/**
* {@inheritdoc}
*
* @param string $prefix
* @return array
*/
public function queryKeys($prefix = null)
{
if (!$prefix) {
$prefix = $this->_prefix;
} else {
$prefix = $this->getPrefixedIdentifier($prefix);
}
$keys = [];
$globalPrefix = $this->_prefix;
$this->db->scan($this->namespace, $this->set, function ($record) use(&$keys, $prefix, $globalPrefix) {
$key = $record['key']['key'];
if (empty($prefix) || 0 === strpos($key, $prefix)) {
$keys[] = preg_replace(sprintf('#^%s(.+)#u', preg_quote($globalPrefix)), '$1', $key);
}
});
return $keys;
}
