public RendererInterface::renderRoot(&$elements)
Renders final HTML given a structured array tree.
Calls ::render() in such a way that placeholders are replaced.
Should therefore only be used in occasions where the final rendering is happening, just before sending a Response:
(Cannot be executed within another render context.)
array $elements: The structured array describing the data to be rendered.
\Drupal\Component\Render\MarkupInterface The rendered HTML.
\LogicException When called from inside another renderRoot() call.
\Drupal\Core\Render\RendererInterface::render()
public function renderRoot(&$elements);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Render!RendererInterface.php/function/RendererInterface::renderRoot/8.1.x