public ConfigFactoryInterface::listAll($prefix = '')
Gets configuration object names starting with a given prefix.
string $prefix: (optional) The prefix to search for. If omitted, all configuration object names that exist are returned.
array An array containing matching configuration object names.
\Drupal\Core\Config\StorageInterface::listAll()
public function listAll($prefix = '');
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!ConfigFactoryInterface.php/function/ConfigFactoryInterface::listAll/8.1.x