添加PHP源

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sudo apt-get install python-software-properties software-properties-common
sudo LC_ALL=C.UTF-8 add-apt-repository ppa:ondrej/php
sudo apt-get update

安装PHP7和常用扩展

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sudo apt-get install php7.0 php7.0-fpm php7.0-mysql -y

卸载php7

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sudo apt-get purge php7.0-common