(PHP 4 >= 4.0.5, PHP 5 <= 5.0.5, PECL mnogosearch:1.0.0)
udm_free_agent — Free mnoGoSearch session
Freeing up memory allocated for agent session.
A link to Agent, received after call to udm_alloc_agent().
如果成功则返回 TRUE，失败则返回 FALSE。