token.
	 *
	 * @since 4.0.0
	 *
	 * @param string $token Session token to update.
	 * @param array  $session Session information.
	 */
	final public function update( $token, $session ) {
		$verifier = $this->hash_token( $token );
		$this->update_session( $verifier, $session );
	}

	/**
	 * Destroys the session with the given token.
	 *
	 * @since 4.0.0
	 *
	 * @param string $token Session token to destroy.
	 */
	final public function destroy( $token ) {
		$verifier = $this->hash_token( $token );
		$this->update_session( $verifier, null );
	}

	/**
	 * Destroys all sessions for this user except the one with the given token (presumably the one in use).
	 *
	 * @since 4.0.0
	 *
	 * @param string $token_to_keep Session token to keep.
	 */
	final public function destroy_others( $token_to_keep ) {
		$verifier = $this->hash_token( $token_to_keep );
		$session  = $this->get_session( $verifier );
		if ( $session ) {
			$this->destroy_other_sessions( $verifier );
		} else {
			$this->destroy_all_sessions();
		}
	}

	/**
	 * Determines whether a session is still valid, based on its expiration timestamp.
	 *
	 * @since 4.0.0
	 *
	 * @param array $session Session to check.
	 * @return bool Whether session is valid.
	 */
	final protected function is_still_valid( $session ) {
		return $session['expiration'] >= time();
	}

	/**
	 * Destroys all sessions for a user.
	 *
	 * @since 4.0.0
	 */
	final public function destroy_all() {
		$this->destroy_all_sessions();
	}

	/**
	 * Destroys all sessions for all users.
	 *
	 * @since 4.0.0
	 */
	final public static function destroy_all_for_all_users() {
		/** This filter is documented in wp-includes/class-wp-session-tokens.php */
		$manager = apply_filters( 'session_token_manager', 'WP_User_Meta_Session_Tokens' );
		call_user_func( array( $manager, 'drop_sessions' ) );
	}

	/**
	 * Retrieves all sessions for a user.
	 *
	 * @since 4.0.0
	 *
	 * @return array Sessions for a user.
	 */
	final public function get_all() {
		return array_values( $this->get_sessions() );
	}

	/**
	 * Retrieves all sessions of the user.
	 *
	 * @since 4.0.0
	 *
	 * @return array Sessions of the user.
	 */
	abstract protected function get_sessions();

	/**
	 * Retrieves a session based on its verifier (token hash).
	 *
	 * @since 4.0.0
	 *
	 * @param string $verifier Verifier for the session to retrieve.
	 * @return array|null The session, or null if it does not exist.
	 */
	abstract protected function get_session( $verifier );

	/**
	 * Updates a session based on its verifier (token hash).
	 *
	 * Omitting the second argument destroys the session.
	 *
	 * @since 4.0.0
	 *
	 * @param string $verifier Verifier for the session to update.
	 * @param array  $session  Optional. Session. Omitting this argument destroys the session.
	 */
	abstract protected function update_session( $verifier, $session = null );

	/**
	 * Destroys all sessions for this user, except the single session with the given verifier.
	 *
	 * @since 4.0.0
	 *
	 * @param string $verifier Verifier of the session to keep.
	 */
	abstract protected function destroy_other_sessions( $verifier );

	/**
	 * Destroys all sessions for the user.
	 *
	 * @since 4.0.0
	 */
	abstract protected function destroy_all_sessions();

	/**
	 * Destroys all sessions for all users.
	 *
	 * @since 4.0.0
	 */
	public static function drop_sessions() {}
}
<br />
<b>Fatal error</b>:  Uncaught Error: Class 'WP_Session_Tokens' not found in /home/svecomtr/public_html/wp-includes/class-wp-user-meta-session-tokens.php:17
Stack trace:
#0 /home/svecomtr/public_html/wp-settings.php(208): require()
#1 /home/svecomtr/public_html/wp-config.php(101): require_once('/home/svecomtr/...')
#2 /home/svecomtr/public_html/wp-load.php(50): require_once('/home/svecomtr/...')
#3 /home/svecomtr/public_html/wp-blog-header.php(13): require_once('/home/svecomtr/...')
#4 /home/svecomtr/public_html/index.php(17): require('/home/svecomtr/...')
#5 {main}
  thrown in <b>/home/svecomtr/public_html/wp-includes/class-wp-user-meta-session-tokens.php</b> on line <b>17</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to a member function set() on null in /home/svecomtr/public_html/wp-includes/l10n.php:856
Stack trace:
#0 /home/svecomtr/public_html/wp-includes/l10n.php(959): load_textdomain('default', '/home/svecomtr/...', 'tr_TR')
#1 /home/svecomtr/public_html/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain()
#2 [internal function]: WP_Fatal_Error_Handler-&gt;handle()
#3 {main}
  thrown in <b>/home/svecomtr/public_html/wp-includes/l10n.php</b> on line <b>856</b><br />