> wget http://pecl.php.net/get/yaf-3.0.8.tgz
> sudo tar -zxvf yaf-3.0.8.tgz
> cd yaf-3.0.8
> sudo /usr/bin/phpize7.1
> sudo ./configure --with-php-config=/usr/bin/php-config7.1
> sudo make && sudo make install
> sudo vim /etc/php/7.1/fpm/php.ini
> sudo vim /etc/php/7.1/cli/php.ini
> sudo service php7.1-fpm restart

编辑 php.ini 在尾部添加

[yaf]
yaf.use_namespace = 1
yaf.environ = "product"
yaf.cache_config = 0
yaf.name_suffix = 1
yaf.lowcase_path = 1
extension = yaf.so