public PageVariantInterface::setTitle($title)
Sets the title for the page being rendered.
string|array $title: The page title: either a string for plain titles or a render array for formatted titles.
$this
public function setTitle($title);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Display!PageVariantInterface.php/function/PageVariantInterface::setTitle/8.1.x