默认的yum源无法升级PHP，需要添加第三方yum源，我们选择webtatic库
CentOs 5.x
rpm -Uvh http://mirror.webtatic.com/yum/el5/latest.rpm
CentOs 6.x
rpm -Uvh http://mirror.webtatic.com/yum/el6/latest.rpm
CentOs 7.X
rpm -Uvh https://mirror.webtatic.com/yum/el7/epel-release.rpm
rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
我们以php7.2为例：
正式安装php7.2：
1.查看yum源是否有php7.2安装包
yum list php72
2.安装php及相关插件
yum install php71w-cli php71w-common php71w-devel php71w-embedded php71w-fpm php71w-gd php71w-mbstring php71w-mysqlnd php71w-opcache php71w-pdo php71w-xml php71w php71w-bcmath php71w-dba php71w-enchant php71w-imap php71w-interbase php71w-intl php71w-ldap php71w-mcrypt php71w-odbc php71w-pdo_dblib php71w-pear php71w-pecl-apcu php71w-pecl-imagick php71w-pecl-xdebug php71w-pgsql php71w-phpdbg php71w-process php71w-pspell php71w-recode php71w-snmp php71w-soap php71w-tidy php71w-xmlrpc php71w-pecl-igbinary php71w-intl php71w-memcached php71w-pecl-mongodb
其他版本php安装
如果想安装php7.0或者7.1版本，将上面的php72w替换为php70w或者php71w就可以了。
安装php扩展根据自己需求来
php72w-cli
php72w-common
php72w-devel
php72w-embedded
php72w-fpm
php72w-gd
php72w-mbstring
php72w-mysqlnd
php72w-opcache
php72w-pdo
php72w-xml
php72w
php72w-bcmath
php72w-dba
php72w-enchant
php72w-imap
php72w-interbase
php72w-intl
php72w-ldap
php72w-mcrypt
php72w-odbc
php72w-pdo_dblib
php72w-pear
php72w-pecl-apcu
php72w-pecl-imagick
php72w-pecl-xdebug
php72w-pgsql
php72w-phpdbg
php72w-process
php72w-pspell
php72w-recode
php72w-snmp
php72w-soap
php72w-tidy
php72w-xmlrpc
php72w-pecl-igbinary
php72w-intl
php72w-memcached
php72w-pecl-mongodb
推荐用 php72w-mysqlnd 替代 php72w-mysql
3.查看当前php版本
php -v
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CentOS 7 升级Php版本 5.6 -> 7.2
https://blog.51cto.com/u_15482433/4926302
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