If you moved your site to a new server, you might run into the error "Your PHP installation appears to be missing the MySQL extension which is required by WordPress." This often happens when you switch to a hosting that used PHP 5.4 and your new host uses PHP 5.5. Here is how to solve it. First you need to log onto your website’s cpanel. Now open the file manager and browse to the folder or place where the wordpress files of your website are stored. Make sure you are on the root folder.
Now, find the file that goes by the name php.ini. Delete this file and try loading the website again. If it does not work, restart the server and try again. For some these steps worked.
* Go to WHM
* Search for MultiPHP Manager
* Set PHP Version
* Select the domain that is not working
* If it is inherited, change the PHP Version to the one you need and click Apply
* After this, the PHP-FPM is available, so choose On and apply
* Then it Worked!
If you have no experience in handling the files, feel free to get in touch with me. I would be happy to solve your problem for a small donation.