php redis pub sub 消息订阅
一.场景介绍
最近的一个项目需要用到发布/订阅的信息系统，以做到最新实时消息的通知。经查找后发现了redis pub/sub(发布/订阅的信息系统)可以满足我的开发需求,而且学习成本和使用成本也比较低。
二.什么是redis pub/sub
资料查看
大家在看我的blog的同时可以打开redis官方对于redis pub/sub的介绍，感觉看英文文档吃力的话
，可以看redis中文网的翻译介绍.
Pub/Sub功能（means Publish, Subscribe）即发布及订阅功能
1> 基于事件的系统中，Pub/Sub是目前广泛使用的通信模型，它采用事件作为基本的通信机制，提供大规模系统所要求的松散耦合的交互模式：订阅者(如客户端)以事件订阅的方式表达出它有兴趣接收的一个事件或一类事件；发布者(如服务器)可将订阅者感兴趣的事件随时通知相关订阅者。
2> 消息发布者，即publish客户端，无需独占链接，你可以在publish消息的同时，使用同一个redis-client链接进行其他操作（例如：INCR等）
3> 消息订阅者，即subscribe客户端，需要独占链接，即进行subscribe期间，redis-client无法穿插其他操作，此时client以阻塞的方式等待“publish端”的消息；这一点很好理解，因此subscribe端需要使用单独的链接，甚至需要在额外的线程中使用。
三.redis pub sub(publish subscribe)之基本使用
下面我将配着实图(用我的本地机器环境)来为大家讲解redis的pub/sub怎么去使用 .
没有安装phpredis扩展的或者没有redis服务的，请参考我的另一篇blog，有详细的安装介绍，这里不再赘述了。
1、启动redis服务端:
2、启动subscribe客户端
新开一个终端,启动redis客户端，并做为subscribe客户端(消息订阅者)，订阅一个名字叫test的频道的频道信息：
3、启动publish客户端
启动redis客户端，并做为publish客户端(消息发布者)，发布一个名字叫test的频道,信息是:hello,world
4、查看订阅到的消息
再切换到2步骤中的redis客户端窗口，会发现，已经订阅到了刚才发布的 ‘hello,world’消息:
码字不易，望转载注明出处哈
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