解决CentOS下更新PHP版本时遇到的webtatic仓库连接失败问题

输入

sudo yum install php php-devel php-cli php-common php-gd php-ldap php-mbstring php-pdo php-mysqlnd php-fpm php-opcache php-pecl-redis php-pecl-mongodb

产生报错如下：

Loaded plugins: fastestmirror
Determining fastest mirrors
Could not retrieve mirrorlist https://mirror.webtatic.com/yum/el7/x86_64/mirrorlist error was
14: curl#7 - "Failed to connect to 2606:4700:3030::ac43:8d44: Network is unreachable"

One of the configured repositories failed (Unknown),
and yum doesn't have enough cached data to continue. At this point the only
safe thing yum can do is fail. There are a few ways to work "fix" this:

     1. Contact the upstream for the repository and get them to fix the problem.

     2. Reconfigure the baseurl/etc. for the repository, to point to a working
        upstream. This is most often useful if you are using a newer
        distribution release than is supported by the repository (and the
        packages for the previous distribution release still work).

     3. Run the command with the repository temporarily disabled
            yum --disablerepo=<repoid> ...

     4. Disable the repository permanently, so yum won't use it by default. Yum
        will then just ignore the repository until you permanently enable it
        again or use --enablerepo for temporary usage:

            yum-config-manager --disable <repoid>
        or
            subscription-manager repos --disable=<repoid>

     5. Configure the failing repository to be skipped, if it is unavailable.
        Note that yum will try to contact the repo. when it runs most commands,
        so will have to try and fail each time (and thus. yum will be be much
        slower). If it is a very temporary problem though, this is often a nice
        compromise:

            yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true

Cannot find a valid baseurl for repo: webtatic/x86_64

解决方法：

1. 禁用webtatic仓库

使用yum-config-manager禁用webtatic仓库：

sudo yum-config-manager --disable webtatic

如果yum-config-manager报告仓库不存在，可以尝试删除相关配置文件：

sudo rm -f /etc/yum.repos.d/webtatic.repo

2. 刷新yum缓存

清除旧的缓存：

sudo yum clean all

创建新的缓存：

sudo yum makecache

3. 重新尝试安装PHP及其相关组件

sudo yum install php php-devel php-cli php-common php-gd php-ldap php-mbstring php-pdo php-mysqlnd php-fpm php-opcache php-pecl-redis php-pecl-mongodb

4. 验证安装

安装完成后，验证PHP版本以确认是否已成功安装：

php -v

如果有类似于以下的输出，表明PHP 7.2已经正确安装：

PHP 7.2.x (cli) (built: YYYY-MM-DD)
Copyright (c) 1997-2018 The PHP Group
Zend Engine v7.2.x, Copyright (c) 1998-2018 Zend Technologies