As a root user, download this script and put it in /www/server/panel/install/modified-swoole-install.sh
cd /www/server/panel/install/
wget https://gist.githubusercontent.com/AndreiTelteu/c92ef2414cc97e2c76f539cc988652d0/raw/abf316cd872ad75be34ce5572bb7ff3dac6819ce/modified-swoole-install.sh
chmod +x modified-swoole-install.sh
bash modified-swoole-install.sh install 80
Done ! installed and activated