public function DefaultMenuLinkTreeManipulators::flatten in Drupal 9

Same name and namespace in other branches

1. 8 core/lib/Drupal/Core/Menu/DefaultMenuLinkTreeManipulators.php \Drupal\Core\Menu\DefaultMenuLinkTreeManipulators::flatten()

Flattens the tree to a single level.

Parameters

\Drupal\Core\Menu\MenuLinkTreeElement[] $tree: The menu link tree to manipulate.

Return value

\Drupal\Core\Menu\MenuLinkTreeElement[] The manipulated menu link tree.

File

core/lib/Drupal/Core/Menu/DefaultMenuLinkTreeManipulators.php, line 251

Class

DefaultMenuLinkTreeManipulators

Provides a couple of menu link tree manipulators.

Namespace

Drupal\Core\Menu

Code

public function flatten(array $tree) {
  foreach ($tree as $key => $element) {
    if ($tree[$key]->subtree) {
      $tree += $this
        ->flatten($tree[$key]->subtree);
    }
    $tree[$key]->subtree = [];
  }
  return $tree;
}