https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Render%21Element.php/function/Element%3A%3AisRenderArray/11.x
function Element::isRenderArray | Drupal API
functionelementdrupalapi
https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Render%21Element.php/function/Element%3A%3AisRenderArray/10
function Element::isRenderArray | Drupal API
functionelementdrupalapi