public InstallStorage::exists($name)
Returns whether a configuration object exists.
string $name: The name of a configuration object to test.
bool TRUE if the configuration object exists, FALSE otherwise.
Overrides FileStorage::exists
public function exists($name) { return array_key_exists($name, $this->getAllFolders()); }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!InstallStorage.php/function/InstallStorage::exists/8.1.x