public PageVariantInterface::setMainContent(array $main_content)
Sets the main content for the page being rendered.
array $main_content: The render array representing the main content.
$this
public function setMainContent(array $main_content);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Display!PageVariantInterface.php/function/PageVariantInterface::setMainContent/8.1.x