Deployed Wordpress 3.8 for a client this afternoon on a vanilla CentOS 6.0 cloud server which was missing the LAMP stack. After configuring MySQL, Apache, and the Wordpress wp-config.php I received a MySQL extension error in the browser.

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

Oops, I forgot a package.

Run:

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yum install php-mysql

Kick Apache:

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service httpd restart

Refresh browser.