查看当前 PHP 版本
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php -v
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查看当前 PHP 相关的安装包，删除之
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yum list installed | grep php
yum remove phpyum remove php-* |
更换 RPM 源
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#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
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安装新版本 PHP
php 7.0/7.1/7.2 分别表示为 70w/71w/72w
目前（2018-5-4）
CentOs 6.x 的 RPM 源中最高只有 7.1
CentOs 7.x 的 RPM 源中有 7.2
yum install -y php71w php71w-cli php71w-common php71w-devel php71w-embedded php71w-fpm php71w-gd php71w-mbstring php71w-mysqlnd php71w-opcache php71w-pdo php71w-xml php71w-ldap php71w-mcrypt
再次检查版本
php -v
启动PHP-fpm
systemctl start php-fpm