使用ppa增加源:

$ sudo apt-get install python-software-properties
$ sudo add-apt-repository ppa:ondrej/php
$ sudo apt-get update
$ sudo apt-get install -y php7.0 php7.0-mysql php7.0-curl php7.0-json php7.0-cgi

然後可以檢視php版本:
php -v

關於php5.4–php5.6版本

$ sudo apt-get install python-software-properties
$ sudo add-apt
 
-repository ppa:ondrej/php
$ sudo apt-get update
$ sudo apt-get -y install php5.6 php5.6-mcrypt php5.6-mbstring php5.6-curl php5.6-cli php5.6-mysql php5.6-gd php5.6-intl php5.6-xsl php5.6-zip

檢視php7的擴充套件
sudo apt-cache search php7-*

或者可以原始碼安裝
1.下載php7的原始碼包
2.tar -zxvf 解壓
3.安裝一些依賴
sudo apt-get install php5-mcrypt libmcrypt-dev
sudo apt-get install libxslt-dev libxml2-dev

4./configure –prefix=/zhou.data/php/php7 –enable-maintainer-zts -with-mysqli=mysqlnd –with-pdo-mysql=mysqlnd –with-mhash –with-openssl –with-zlib –with-bz2 –with-curl –with-zlib –enable-mbstring –with-mcrypt –enable-sockets –with-xsl –enable-zip –with-pear –enable-session –enable-xml –enable-shared –enable-bcmath –enable-sysvmsg –enable-sysvsem –enable-sysvshm –enable-mbregex –enable-pcntl –with-xmlrpc
5.make && make install
6.如果報錯，缺少哪些依賴，就一次安裝即可