When I upgraded MySQL, the PHP linked database reported an error. After checking the data, I found that the MySQL version was changed, which was inconsistent with the previously compiled version, so the error was reported. The solution was to recompile mySQLND, my MySQL and PHP installed by YUM were very simple.

killall php-fpm
yum remove php70w-mysql
yum install php70w-mysqlnd

After installation, just restart PHP-FPM!