public RenderCacheInterface::get(array $elements)
Gets the cached, pre-rendered element of a renderable element from cache.
array $elements: A renderable array.
array|false A renderable array, with the original element and all its children pre- rendered, or FALSE if no cached copy of the element is available.
\Drupal\Core\Render\RendererInterface::render()
::set()
public function get(array $elements);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Render!RenderCacheInterface.php/function/RenderCacheInterface::get/8.1.x