interface SessionHandlerInterface

bootstrap.php in drupal/core/vendor/symfony/http-foundation/Symfony/Component/HttpFoundation/Tests/bootstrap.php

SessionHandlerProxyTest::setUp in drupal/core/vendor/symfony/http-foundation/Symfony/Component/HttpFoundation/Tests/Session/Storage/Proxy/SessionHandlerProxyTest.php

interface SessionHandlerInterface {

  /**
   * Open session.
   *
   * @see http://php.net/sessionhandlerinterface.open
   *
   * @param string $savePath    Save path.
   * @param string $sessionName Session Name.
   *
   * @throws \RuntimeException If something goes wrong starting the session.
   *
   * @return boolean
   */
  public function open($savePath, $sessionName);

  /**
   * Close session.
   *
   * @see http://php.net/sessionhandlerinterface.close
   *
   * @return boolean
   */
  public function close();

  /**
   * Read session.
   *
   * @see http://php.net/sessionhandlerinterface.read
   *
   * @throws \RuntimeException On fatal error but not "record not found".
   *
   * @return string String as stored in persistent storage or empty string in all other cases.
   */
  public function read($sessionId);

  /**
   * Commit session to storage.
   *
   * @see http://php.net/sessionhandlerinterface.write
   *
   * @param string $sessionId Session ID.
   * @param string $data      Session serialized data to save.
   *
   * @return boolean
   */
  public function write($sessionId, $data);

  /**
   * Destroys this session.
   *
   * @see http://php.net/sessionhandlerinterface.destroy
   *
   * @param string $sessionId Session ID.
   *
   * @throws \RuntimeException On fatal error.
   *
   * @return boolean
   */
  public function destroy($sessionId);

  /**
   * Garbage collection for storage.
   *
   * @see http://php.net/sessionhandlerinterface.gc
   *
   * @param integer $lifetime Max lifetime in seconds to keep sessions stored.
   *
   * @throws \RuntimeException On fatal error.
   *
   * @return boolean
   */
  public function gc($lifetime);

}