+

Yoast SEO Premium', 'yoast.com' ); $premium_popup = new WPSEO_Premium_Popup( 'add-keyword', 'h1', $popup_title, $popup_content ); echo $premium_popup->get_premium_message(); return ob_get_clean(); } /** * Returns an empty string because this tab has no content * * @return string */ public function content() { return ''; } }