说明

Writes the session data to the session storage. Called by normal PHP shutdown, by session_write_close(), or when session_register_shutdown() fails. PHP will call SessionHandler::close() immediately after this method returns.

This method wraps the internal PHP save handler defined in the session.save_handler ini setting that was set before this handler was set by session_set_save_handler().

If this class is extended by inheritiance, calling the parent write method will invoke the wrapper for this method and therefore invoke the associated internal callback. This allows this method to be overridden and or intercepted and filtered (for example, encrypting the $data value before sending it to the parent write method).

For more information on what this method is expected to do, please refer to the documentation at SessionHandlerInterface::write().