(PHP 4 >= 4.0.1, PECL yaz >= 0.9.0)
yaz_error — Returns error description
$id
   )yaz_error() returns an English text message corresponding to the last error number as returned by yaz_errno().
   Returns an error text message for server (last request), identified by
   parameter id. An empty string is returned if the
   last operation was successful.