centos7中安装PHP7+
1、在centos7中先切换yum安装源
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
以上如出错则可尝试下面的，
yum install epel-release -y
rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
更新完成后为防止冲突，先删除可能存在的php包
yum -y remove php*
2、安装PHP
yum install -y php71w
3、安装PHP依赖
yum install -y php71w-fpm php71w-opcache php71w-cli php71w-gd php71w-imap php71w-mysqlnd php71w-mbstring php71w-mcrypt php71w-pdo php71w-pecl-apcu php71w-pecl-mongodb php71w-pecl-redis php71w-pgsql php71w-xml php71w-xmlrpc php71w-devel mod_php71w
安装完成后可查看PHP版本信息
php -v
4、将mysql与php关联（须在已经安装完MySQL的前提下）
yum -y install php-mysql --skip-broken
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