(PHP 4 >= 4.0.1, PECL yaz >= 0.9.0)
yaz_close — Close YAZ connection
$id): bool
   Closes the connection given by parameter id.
  
注意:
This function will only close a non-persistent connection opened by setting the
persistentoption tofalsewith yaz_connect().
   成功时返回 true, 或者在失败时返回 false。