如题：
网上没有相关文章
解决方案：
可能是epel源问题：
1.获取php7.0的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
2.yum search php-mysql
============================================================== Name Matched: php-mysql ==============================================================
php-mysqlnd.x86_64 : A module for PHP applications that use MySQL databases
是名字错误：
yum install php-mysqlnd
完美解决：