public RendererInterface::mergeBubbleableMetadata(array $a, array $b)
Merges the bubbleable rendering metadata o/t 2nd render array with the 1st.
array $a: A render array.
array $b: A render array.
array The first render array, modified to also contain the bubbleable rendering metadata of the second render array.
\Drupal\Core\Render\BubbleableMetadata
public function mergeBubbleableMetadata(array $a, array $b);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Render!RendererInterface.php/function/RendererInterface::mergeBubbleableMetadata/8.1.x