public ConfigFactoryInterface::rename($old_name, $new_name)
Renames a configuration object using the storage.
string $old_name: The old name of the configuration object.
string $new_name: The new name of the configuration object.
$this
public function rename($old_name, $new_name);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!ConfigFactoryInterface.php/function/ConfigFactoryInterface::rename/8.1.x