public MenuLinkBase::getParent()
Returns the plugin ID of the menu link's parent, or an empty string.
string The parent plugin ID.
Overrides MenuLinkInterface::getParent
public function getParent() { return $this->pluginDefinition['parent']; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Menu!MenuLinkBase.php/function/MenuLinkBase::getParent/8.1.x