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Libevent 是一个用C语言编写的、轻量级的开源高性能I/O框架，支持多种 I/O 多路复用技术： epoll、 poll、 dev/poll、 select 和 kqueue 等；支持 I/O，定时器和信号等事件；注册事件优先级。PHP提供了对应的扩展 libevent、 Event 。

相比 libevent ext, event ext 拥有更好的性能表现和更全面的API，可以让我们更友好的使用 Libevent。

php event 扩展 依赖 Libevent 库，需要先编译安装（注意是 Libevent 库，非 libevent 扩展）。

git clone --depth=1 https://github.com/nmathewson/Libevent.gitcd Libevent./autogen.sh./configure --prefix=/usr/local/libeventmake && make install

可以直接使用 pecl 安装

pecl install eventdownloading event-2.5.3.tgz ...Starting to download event-2.5.3.tgz (140,913 bytes)..............................done: 140,913 bytes50 source files, buildingrunning: phpizeConfiguring for:PHP Api Version:         20180731Zend Module Api No:      20180731Zend Extension Api No:   320180731Enable internal debugging in Event [no] : Enable sockets support in Event [yes] : libevent installation prefix [/usr] : /usr/local/libevent...Build process completed successfullyInstalling '/usr/local/php/lib/php/extensions/no-debug-non-zts-20180731/event.so'install ok: channel://pecl.php.net/event-2.5.3Extension event enabled in php.ini

查看安装结果

[root@localhost ~]# php --ri eventeventEvent support => enabledSockets support => enabledDebug support => disabledExtra functionality support including HTTP, DNS, and RPC => enabledOpenSSL support => enabledThread safety support => disabledExtension version => 2.5.3libevent2 headers version => 2.2.0-alpha-dev