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