安装php-memcached扩展 https://github.com/php-memcached-dev/php-memcached tar -zxvf php-memcached-3.1.3.tar.gz && cd /root/php-memcached-3.1.3 && /usr/local/php7/bin/phpize && ./configure --with-php-config=/usr/local/php7/bin/php-config --with-libmemcached-dir=/usr/local/libmemcached --disable-memcached-