安装swoole扩展，怎么安装到7.0下去了，我本来编译的版本是7.19版本，但是没吃
直接安装提示这个：
www@TinywanAliYun:~$ pecl install swoole The program ‘pecl‘ is currently not installed. To run ‘pecl‘ please ask your administrator to install the package ‘php-pear‘
sudo apt-get install php-pear
$ sudo add-apt-repository ppa:ondrej/php $ sudo apt-get update $ sudo apt-get upgrade php