sudo add-apt-repository ppa:ondrej/php sudo apt-get update
apt-cache search php7.1
apt-get install php7.1
a2dismod php5 # 如果之前有其他版本，在这边禁用掉
a2enmod php7.1
apt-get install php7.1-mysql
apt-get install php7.1-curl
apt-get install php7.1-mbstring
apt-get install php7.1-gd
apt-get install php7.1-xml
apt-get install php7.1-soap
apt-get install php7.1-mcrypt
