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                **TTL,Time to Live 的簡稱,即過期時間。** 目前有兩種方法可以設置消息的TTL。 1.通過Queue屬性設置,隊列中所有消息都有相同的過期時間。 ``` $connection = new AMQPStreamConnection('192.168.33.1', 5672, 'zhangcs', 'zhangcs', '/'); $channel = $connection->channel(); // 通過隊列屬性設置消息過期時間為10s, 然后在管理頁面查看10s之后消息是否消失 $arguments = new AMQPTable(); $arguments->set("x-message-ttl", 10000); $queueName = 'test_msg_ttl'; $channel->queue_declare($queueName, false, true, false, false, false, $arguments); $message = new AMQPMessage('Hello RabbitMQ'); $channel->basic_publish($message, '', $queueName); $channel->close(); $connection->close(); ``` 2.對消息自身進行單獨設置,每條消息的TTL 可以不同。 ``` $connection = new AMQPStreamConnection('192.168.33.1', 5672, 'zhangcs', 'zhangcs', '/'); $channel = $connection->channel(); $queueName = 'test_msg_ttl1'; $channel->queue_declare($queueName, false, true, false, false); // 通過消息屬性設置消息過期時間為10s, 然后在管理頁面查看10s之后消息是否消失 $message = new AMQPMessage('Hello RabbitMQ', ['expiration' => 10000]); $channel->basic_publish($message, '', $queueName); $channel->close(); $connection->close(); ``` **如果兩種方法一起使用,則消息的TTL 以兩者之間較小數值為準。** 通常來講,消息在隊列中的生存時間一旦超過設置的TTL 值時,就會變成“死信”(Dead Message),消費者默認就無法再收到該消息。當然,“死信”也是可以被取出來消費
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