安装：

如果之前有其他版本PHP，在这边禁用掉

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sudo a2dismod php5

再来安装做准备

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sudo apt-get install software-properties-common python-software-properties

sudo add-apt-repository ppa:ondrej/php && sudo apt-get update

sudo apt-get -y install php7.2

sudo a2enmod php7.2

安装常用扩展

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sudo -y apt-get install php7.2-fpm php7.2-mysql php7.2-curl php7.2-json php7.2-mbstring php7.2-xml  php7.2-intl

安装其他扩展(按需安装)

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sudo apt-get install php7.2-gd

sudo apt-get install php7.2-soap

sudo apt-get install php7.2-gmp

sudo apt-get install php7.2-odbc

sudo apt-get install php7.2-pspell

sudo apt-get install php7.2-bcmath

sudo apt-get install php7.2-enchant

sudo apt-get install php7.2-imap

sudo apt-get install php7.2-ldap

sudo apt-get install php7.2-opcache

sudo apt-get install php7.2-readline

sudo apt-get install php7.2-sqlite3

sudo apt-get install php7.2-xmlrpc

sudo apt-get install php7.2-bz2

sudo apt-get install php7.2-interbase

sudo apt-get install php7.2-pgsql

sudo apt-get install php7.2-recode

sudo apt-get install php7.2-sybase

sudo apt-get install php7.2-xsl

sudo apt-get install php7.2-cgi

sudo apt-get install php7.2-dba

sudo apt-get install php7.2-phpdbg

sudo apt-get install php7.2-snmp

sudo apt-get install php7.2-tidy

sudo apt-get install php7.2-zip

卸载：

一、删除php的相关包及配置

sudo apt-get autoremove php7*

二、删除关联

sudo find /etc -name "*php*" |xargs  rm -rf

三、清除dept列表

sudo apt purge `dpkg -l | grep php| awk '{print $2}' |tr "\n" " "`

四、检查是否卸载干净(无返回就是卸载完成)

dpkg -l | grep php7.0

引用：https://www.cnblogs.com/chancy/p/9443930.html