背景：当前php版本为7.0.31，升级为php7.1.*

参考链接：https://www.cnblogs.com/lightsrs/p/7899676.html

1、由于linux的yum源不存在php7.x，所以我们要更改yum源：

#rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
#rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm

2、yum查询安装php71w

#yum search php71w

3、yum 安装php71w和各种拓展，选自己需要的即可。

#yum install php71w php71w-cli php71w-common php71w-devel php71w-embedded php71w-fpm php71w-gd php71w-mbstring php71w-mysqlnd php71w-opcache php71w-pdo php71w-xml 

在安装 yum install yum71w-cli 时报错

Error: php71w-common conflicts with php70w-common-7.0.31-1.w7.x86_64
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

修复：yum -y remove php70w-common-7.0.31-1.w7.x86_64

修复完成后重新执行  yum install yum71w-cli 

4. 执行php -v

执行结果显示当前为 PHP 7.1.20 (cli)