Your PHP installation appears to be missing the MySQL extension which is required by WordPress

On CENTOS

If you are running your WordPress site on a CentOS VPS without any kind of control panel. Your first step would be to check the PHP version that you are running.

php -v

Will show you the PHP Version you are currently running. In our case, this is PHP 7.0. We need to install the PHP-MySQL extension for PHP 7.0. We can do this using the following command:

yum update

yum install php70w-mysql

Once installed, restart your web server, for Apache it is:

systemctl restart httpd
Or

service httpd restart
After restarting, your WordPress site should work properly.

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