卸载之前php

yum -y remove php*

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

yum安装php72w和扩展，根据需要自己选

yum -y install php72w php72w-cli php72w-common php72w-devel php72w-embedded php72w-fpm php72w-gd php72w-mbstring php72w-mysqlnd php72w-opcache php72w-pdo php72w-xml 

指定版本号安装例如：7.2.24

先列出php的版本号：

yum list php* --showduplicates | sort -r |grep  php72w

指定版本号安装：

 yum -y install php72w-7.2.24-1.w7 php72w-cli-7.2.24-1.w7 php72w-common-7.2.24-1.w7 php72w-devel-7.2.24-1.w7 php72w-embedded-7.2.24-1.w7 php72w-fpm-7.2.24-1.w7 php72w-gd-7.2.24-1.w7 php72w-mbstring-7.2.24-1.w7 php72w-mysqlnd-7.2.24-1.w7 php72w-opcache-7.2.24-1.w7 php72w-pdo-7.2.24-1.w7 php72w-xml-7.2.24-1.w7 

查看php版本号：

[root@VM_0_9_centos ~]# php -v
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启动

启动php：

systemctl start php-fpm.service