系统版本：centos 7.7（查看系统版本：cat /etc/redhat-release）
执行命令安装swoole：
- yum update -y && yum remove php* -y
- rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
- rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
- yum install -y php72w-cli php72w-common php72w-pear php72w-devel php72w-pecl-redis httpd gcc gcc-c++ make autoconf pcre openssl-devel
- pecl install swoole
- 新建/etc/php.d/swoole.ini，内容为extension=swoole.so
查看swoole信息：php --ri swoole
