[root@localhost hdwiki]# yum list installed | grep php
Repository epel is listed more than once in the configuration
Repository epel-debuginfo is listed more than once in the configuration
Repository epel-source is listed more than once in the configuration
php56w.x86_64                        5.6.36-1.w7                    @webtatic  
php56w-cli.x86_64                    5.6.36-1.w7                    @webtatic  
php56w-common.x86_64                 5.6.36-1.w7                    @webtatic  
php56w-gd.x86_64                     5.6.36-1.w7                    @webtatic  
php56w-intl.x86_64                   5.6.36-1.w7                    @webtatic  
php56w-mbstring.x86_64               5.6.36-1.w7                    @webtatic  
php56w-mcrypt.x86_64                 5.6.36-1.w7                    @webtatic  
php56w-mysql.x86_64                  5.6.36-1.w7                    @/php56w-mysql-5.6.36-1.w7.x86_64
php56w-opcache.x86_64                5.6.36-1.w7                    @webtatic  
php56w-pdo.x86_64                    5.6.36-1.w7                    @webtatic  
php56w-xml.x86_64                    5.6.36-1.w7                    @webtatic  

yum remove php56w-cli.x86_64 php56w-common.x86_64 php56w-gd.x86_64 php56w-intl.x86_64 php56w-mbstring.x86_64 php56w-mcrypt.x86_64 php56w-mysql.x86_64 php56w-opcache.x86_64 php56w-pdo.x86_64 php56w-xml.x86_64

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

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

php -v

php5.6 升级7.2连接数据库报错
Call to undefined function mysqli_init()

新增

yum install -y php72w-pdo

yum install -y php72w-mysql-7.2.16-1.w7.x86_64.rpm