bool, * 'messages' => array, * ) */ public function activate(); /** * Called on Plugin upgrade * @param string $new_version * @param string $old_version * @return array( * 'success' => bool, * 'messages' => array, * ) */ public function upgrade( $new_version, $old_version ); /** * Called on Plugin deactivation * @return array( * 'success' => bool, * 'messages' => array, * ) */ public function deactivate(); /** * Called on Plugin uninstall * @param string $new_version * @param string $old_version * @return array( * 'success' => bool, * 'messages' => array, * ) */ public static function uninstall(); }