public ArrayElement::isEmpty()
Determines whether the data structure is empty.
bool TRUE if the data structure is empty, FALSE otherwise.
Overrides TypedConfigInterface::isEmpty
public function isEmpty() { return empty($this->value); }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!Schema!ArrayElement.php/function/ArrayElement::isEmpty/8.1.x