(PECL stomp >= 0.1.0)
Stomp::unsubscribe -- stomp_unsubscribe — Removes an existing subscription
面向对象风格 (method):
过程化风格:
Removes an existing subscription.
link仅对过程化样式：由 stomp_connect() 返回的 stomp 连接标识符。
destinationSubscription to remove.
headers关联数组包含附加的头信息（例如： receipt）。
See stomp_ack().
Stomp is inherently asynchronous. Synchronous communication can be implemented adding a receipt header. This will cause methods to not return anything until the server has acknowledged receipt of the message or until read timeout was reached.