protected ArrayElement::getAllKeys()
Gets valid configuration data keys.
array Array of valid configuration data keys.
protected function getAllKeys() { return is_array($this->value) ? array_keys($this->value) : array(); }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!Schema!ArrayElement.php/function/ArrayElement::getAllKeys/8.1.x