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

I got this error after installing WordPress in my website “Your PHP installation appears to be missing the MySQL extension which is required by WordPress.” To find out its solution, I did some troubleshooting and got the best result. My website got up live and start working perfectly.
Note: For new WordPress installation, you have to wait for a few hours after doing this process in this video to make your website working.
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