原来的dobdeb对于jessie等都不再支持7.2了，所以新的7.2只能从sury上进行获取

执行： 
#!/bin/bash
# To add this repository please do:

if [ "$(whoami)" != "root" ]; then
SUDO=sudo
fi

${SUDO} apt-get -y install apt-transport-https lsb-release ca-certificates
${SUDO} wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg
${SUDO} sh -c 'echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/php.list'
${SUDO} apt-get update
记不住没关系，打开网址：https://packages.sury.org/php/，就有Readme了。复制粘贴运行一下就行！