is_free() публичный Метод

Checks if using the free version of the plugin.
public is_free ( ) : boolean
Результат boolean
 /**
  * Initializes the banner sidebar by setting its banner spots.
  *
  * @param WPSEO_Features $features Class regarding WPSEO Features.
  */
 public function initialize(WPSEO_Features $features)
 {
     if ($features->is_free()) {
         $this->add_banner_spot($this->get_premium_spot());
     }
     $this->add_banner_spot($this->get_services_spot());
     $extensions_spot = $this->get_extensions_spot($this->get_active_extensions());
     if ($extensions_spot->has_banners()) {
         $this->add_banner_spot($extensions_spot);
     }
     $this->add_banner_spot($this->get_courses_spot());
     $this->add_banner_spot($this->get_remove_banner_spot());
 }
 /**
  * Returns a premium upsell section if using the free plugin.
  *
  * @return string
  */
 protected function get_premium_upsell_section()
 {
     $features = new WPSEO_Features();
     if ($features->is_free()) {
         /* translators: %1$s expands anchor to premium plugin page, %2$s expands to </a> */
         return sprintf(__('By the way, did you know we also have a %1$sPremium plugin%2$s? It offers advanced features, like a redirect manager and support for multiple keywords. It also comes with 24/7 personal support.', 'wordpress-seo'), "<a href='https://yoa.st/premium-notification'>", '</a>');
     }
     return '';
 }