PHP is still one of the most popular languages used to build the web. The newest version, PHP 7.4, was released today — and Business and eCommerce plan customers can opt to start using it immediately.
WordPress.com sites run PHP 7.3 by default — it’s still our recommended version, since it’s been stress-tested across all of WordPress.com — but if you have a site on the Business or eCommerce plan and want to be on the leading technological edge, you can opt to switch to version 7.4 immediately.
Head to My Site > Manage > Hosting Configuration to find the new PHP Version Sw