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