SessionUpdateTimestampHandlerInterface::validateId Validate ID &reftitle.description; abstract public boolSessionUpdateTimestampHandlerInterface::validateId stringid Validates a given session ID. A session ID is valid, if a session with that ID already exists. This function is automatically executed when a session is to be started, a session ID is supplied and session.use_strict_mode is enabled. &reftitle.parameters; id The session ID. &reftitle.returnvalues; Returns &true; for valid ID, &false; otherwise. Note that this value is returned internally to PHP for processing.