public KeyValueStoreInterface::get($key, $default = NULL)
Returns the stored value for a given key.
string $key: The key of the data to retrieve.
mixed $default: The default value to use if the key is not found.
mixed The stored value, or the default value if no value exists.
public function get($key, $default = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!KeyValueStore!KeyValueStoreInterface.php/function/KeyValueStoreInterface::get/8.1.x