public StorageInterface::write($name, array $data)
Writes configuration data to the storage.
string $name: The name of a configuration object to save.
array $data: The configuration data to write.
bool TRUE on success, FALSE in case of an error.
\Drupal\Core\Config\StorageException If the back-end storage does not exist and cannot be created.
public function write($name, array $data);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!StorageInterface.php/function/StorageInterface::write/8.1.x