yum install php-devel
错误信息
Connection to `ssl://pecl.php.net:443′ failed
下载证书
http://curl.haxx.se/ca/cacert.pem
重命名并复制到 /etc/pki/tls/certs/ca-bundle.crt
赋予权限 chmod 744 /etc/pki/tls/certs/ca-bundle.crt
更新 pecl channel-update pecl.php.net
安装swoole
pecl install swoole