workerman
workerman是一个高性能的PHP socket 服务器框架，workerman基于PHP多进程以及libevent事件轮询库，PHP开发者只要实现一两个接口，便可以开发出自己的网络应用，例如Rpc服务、聊天室服务器、手机游戏服务器等。
workerman的目标是让PHP开发者更容易的开发出基于 socket 的高性能的应用服务，而不用去了解PHP socket以及PHP多进程细节。 workerman本身是一个PHP多进程服务器框架，具有PHP进程管理以及socket通信的模块，所以不依赖php-fpm、 nginx 或者 apache 等这些容器便可以独立运行
其中
workerman有两种进程模型
1、基本的master worker模型
2、master gateway worker模型
master worker模型说明：
master进程为主进程，启动过程中读取conf配置，根据每个应用配置中的ip和端口创建监听socket，然后再根据配置中的进程数创建对应数量的子进程即worker进程，worker进程会自动继承master进程创建的监听socket，使得worker进程能够独立的接受并处理客户端的连接。而后master进程进入监听信号的逻辑中，监听worker进程退出信号（worker进程退出后，系统会自动向master进程发送一个SIGHCLD信号，mater进程会重新创建子进程，将缺失的子进程补上），master进程还会监听workermand脚本发来的停止信号（SIGINT）和平滑重启服务信号（SIGHUP）
worker进程为master进程派生出来的子进程，自动继承了master进程的监听socket，每个worker进程独立的接受并处理客户端的连接。
master worker模型比较适合业务简单的应用或者短连接应用
master gateway worker 模型说明：
这种模型多了一个gateway进程组，工作流程与master worker模型基本相同，区别是worker进程不再直接与客户端打交道，客户端与worker进程之间多了一个gateway进程，gateway专职处理网络 IO ，并维护客户端的长连接。
master gateway worker 模型非常适合长连接应用
swoole
Swoole是一个面向生产环境的 PHP 异步网络通信引擎，使 PHP 开发人员可以编写高性能的异步并发 TCP、UDP、Unix Socket、HTTP，WebSocket 服务。Swoole 可以广泛应用于互联网、移动通信、企业软件、云计算、网络游戏、物联网（IOT）、车联网、智能家居等领域。 使用 PHP + Swoole 作为网络通信框架，可以使企业 IT 研发团队的效率大大提升。
Swoole不是一个像Zend Framework、CakePHP、Yii、symfony、 ThinkPHP 等一样的框架，也不是一个像 WordPress 、Drupal、 Discuz 、UChome等开源产品看齐的项目。 Swoole的目标是向Java框架、Ruby On Rails、Python DjangoPylons等一流框架发起挑战。
Swoole虽然是标准的PHP扩展，实际上与普通的扩展不同。普通的扩展只是提供一个库函数。而Swoole扩展在运行后会接管PHP的控制权，进入事件循环。当IO事件发生后底层会自动回调指定的PHP函数。
swoole 底层是纯c 编写，对其他扩展几乎是零依赖，不需要php传统环境做依赖。性能更加强悍，许多国内外大公司都会在swoole的基础上进行二开来满足自己的业务需求。
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