(PHP 4 >= 4.0.5, PHP 5 < 5.1.0, PECL mnogosearch >= 1.0.0)
udm_error — Get mnoGoSearch error message
$agent
Gets the agent error message.
agent
A link to Agent, received after call to udm_alloc_agent().
udm_error() returns mnoGoSearch error message, empty string if no error.