Well, it would appear that updating PHP has broken PHP for Wordpress.
"Your PHP installation appears to be missing the MySQL extension which is required by WordPress."
Sweet
https://help.dreamhost.com/hc/en-us/articles/360004096331-Your-PHP-installation-appears-to-be-missing-the-MySQL-extension-which-is-required-by-WordPress
https://help.dreamhost.com/hc/en-us/articles/214893957-How-do-I-enable-PHP-extensions-and-loaders-
https://help.dreamhost.com/hc/en-us/articles/214200748-My-phprc-file-isn-t-updating
Annoying... I added it to my php.ini file... but it's still not working and I don't see it in the the phpinfo file (http://howtocureinsomnia.com/phpinfo.php).
And even if it does work, I'm not totally clear that mysql will be the right version for all of this...
Easier yet, command "php -v" seems to be telling me all I need to know:
This happens on mysqli, mysql.so, and obviously mysqli.so
I tried "sudo yum install php-mysql --skip-broken" and it installed something that didnt help and I'm guessing caused damage, lol... if so, you can reinstall php 7.3 via this guide: https://bobcares.com/blog/amazon-linux-php-5-6/2/
Just pick up with google search "unable to load dynamic library 'mysql.so' "