https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Session%21WriteSafeSessionHandlerInterface.php/interface/WriteSafeSessionHandlerInterface/8.9.x
interface WriteSafeSessionHandlerInterface | Drupal API
interfacedrupalapi
https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Session%21WriteSafeSessionHandlerInterface.php/9
WriteSafeSessionHandlerInterface.php | Drupal API
phpdrupalapi