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