title: Wordpress Upgrade: Unable to update from Wordpress 3.8 to the latest using WP-CLI due to missing MySQL extension
body: <p>I've moved a legacy site on Wordpress 3.8 from one server to another. The new server is on PHP 7 and I continue to get the error below:</p>
  <p><code>Your PHP installation appears to be missing the MySQL extension which is required by WordPress.</code></p>
  <p>I've tried installing the Wordpress command line tool WP-CLI but still get the same error.</p>
  <p>What should I try next?</p>