#自带的只有5.4版本

yum provides php

[root@localhost etc]# yum provides php
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* epel: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
* webtatic: uk.repo.webtatic.com
mod_php71w-7.1.26-1.w7.x86_64 : PHP module for the Apache HTTP Server
Repo : webtatic
Matched from:
Provides : php = 7.1.26-1.w7

mod_php71w-7.1.27-1.w7.x86_64 : PHP module for the Apache HTTP Server
Repo : webtatic
Matched from:
Provides : php = 7.1.27-1.w7

mod_php71w-7.1.28-1.w7.x86_64 : PHP module for the Apache HTTP Server
Repo : webtatic
Matched from:
Provides : php = 7.1.28-1.w7

mod_php71w-7.1.29-1.w7.x86_64 : PHP module for the Apache HTTP Server
Repo : webtatic
Matched from:
Provides : php = 7.1.29-1.w7

mod_php71w-7.1.30-1.w7.x86_64 : PHP module for the Apache HTTP Server
Repo : webtatic
Matched from:
Provides : php = 7.1.30-1.w7

mod_php71w-7.1.31-1.w7.x86_64 : PHP module for the Apache HTTP Server
Repo : webtatic
Matched from:
Provides : php = 7.1.31-1.w7

mod_php71w-7.1.32-1.w7.x86_64 : PHP module for the Apache HTTP Server
Repo : webtatic
Matched from:
Provides : php = 7.1.32-1.w7

mod_php71w-7.1.33-1.w7.x86_64 : PHP module for the Apache HTTP Server
Repo : webtatic
Matched from:
Provides : php = 7.1.33-1.w7

mod_php72w-7.2.14-1.w7.x86_64 : PHP module for the Apache HTTP Server
Repo : webtatic
Matched from:
Provides : php = 7.2.14-1.w7

mod_php72w-7.2.16-1.w7.x86_64 : PHP module for the Apache HTTP Server
Repo : webtatic
Matched from:
Provides : php = 7.2.16-1.w7

mod_php72w-7.2.17-1.w7.x86_64 : PHP module for the Apache HTTP Server
Repo : webtatic
Matched from:
Provides : php = 7.2.17-1.w7

mod_php72w-7.2.19-1.w7.x86_64 : PHP module for the Apache HTTP Server
Repo : webtatic
Matched from:
Provides : php = 7.2.19-1.w7

mod_php72w-7.2.21-1.w7.x86_64 : PHP module for the Apache HTTP Server
Repo : webtatic
Matched from:
Provides : php = 7.2.21-1.w7

mod_php72w-7.2.22-1.w7.x86_64 : PHP module for the Apache HTTP Server
Repo : webtatic
Matched from:
Provides : php = 7.2.22-1.w7

mod_php72w-7.2.24-1.w7.x86_64 : PHP module for the Apache HTTP Server
Repo : webtatic
Matched from:
Provides : php = 7.2.24-1.w7

php-5.4.16-46.el7.x86_64 : PHP scripting language for creating dynamic web
: sites
Repo : base

php-5.4.16-46.1.el7_7.x86_64 : PHP scripting language for creating dynamic
: web sites
Repo : updates

php55w-5.5.38-1.w7.x86_64 : PHP scripting language for creating dynamic web
: sites
Repo : webtatic
Matched from:
Provides : php = 5.5.38-1.w7

php56w-5.6.40-1.w7.x86_64 : PHP scripting language for creating dynamic web
: sites
Repo : webtatic
Matched from:
Provides : php = 5.6.40-1.w7

php70w-7.0.33-1.w7.x86_64 : PHP scripting language for creating dynamic web
: sites
Repo : webtatic
Matched from:
Provides : php = 7.0.33-1.w7

#更新源

rpm -Uvh https://mirror.webtatic.com/yum/el7/epel-release.rpm
rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm

#移除系统自带的php-common

yum remove php-common -y

#安装依赖包

yum install -y php72w php72w-opcache php72w-xml php72w-mcrypt php72w-gd php72w-devel php72w-mysql php72w-intl php72w-mbstring

#版本变为7.2

php -v

显示以下结果

PHP 7.2.24 (cli) (built: Oct 26 2019 12:28:19) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
with Zend OPcache v7.2.24, Copyright (c) 1999-2018, by Zend Technologies