public RendererInterface::renderPlain(&$elements)
Renders final HTML in situations where no assets are needed.
Calls ::render() in such a way that placeholders are replaced.
Useful for instance when rendering the values of tokens or emails, which need a render array being turned into a string, but do not need any of the bubbleable metadata (the attached assets and cache tags).
Some of these are a relatively common use case and happen *within* a ::renderRoot() call, but that is generally highly problematic (and hence an exception is thrown when a ::renderRoot() call happens within another ::renderRoot() call). However, in this case, we only care about the output, not about the bubbling. Hence this uses a separate render context, to not affect the parent ::renderRoot() call.
(Can be executed within another render context: it runs in isolation.)
array $elements: The structured array describing the data to be rendered.
\Drupal\Component\Render\MarkupInterface The rendered HTML.
\Drupal\Core\Render\RendererInterface::renderRoot()
\Drupal\Core\Render\RendererInterface::render()
public function renderPlain(&$elements);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Render!RendererInterface.php/function/RendererInterface::renderPlain/8.1.x