Same name in other branches

1. 8.9.x core/lib/Drupal/Core/Menu/DefaultMenuLinkTreeManipulators.php \Drupal\Core\Menu\DefaultMenuLinkTreeManipulators::flatten()
2. 10 core/lib/Drupal/Core/Menu/DefaultMenuLinkTreeManipulators.php \Drupal\Core\Menu\DefaultMenuLinkTreeManipulators::flatten()
3. 11.x 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;
}

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