public MenuLinkBase::deleteLink()
Deletes a menu link.
In general, this method should not be called directly, but will be called automatically from MenuLinkManagerInterface::removeDefinition().
This method will only delete the link from any additional storage, but not from the plugin.manager.menu.link service.
\Drupal\Component\Plugin\Exception\PluginException If the link is not deletable.
Overrides MenuLinkInterface::deleteLink
public function deleteLink() { throw new PluginException("Menu link plugin with ID '{$this->getPluginId()}' does not support deletion"); }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Menu!MenuLinkBase.php/function/MenuLinkBase::deleteLink/8.1.x