public static function get_instance() { // If the single instance hasn't been set, set it now. if (null == self::$instance) { self::$instance = new self(); } return self::$instance; }
public function upgrade_plugin() { global $sc_options; if (null === $sc_options->get_setting_value('sub_upgrade_has_run')) { include_once SC_SUB_DIR_PATH . 'classes/class-stripe-subscriptions-upgrade.php'; Stripe_Subscriptions_Upgrade::get_instance(); } $sc_options->add_setting('sub_upgrade_has_run', 1); }