In PHP's case it's about WordPress which still being deployed at a very high rate. While the blogging thing isn't that much in focus anymore, WordPress + Divi + WooCommerce is an extremely common stack for setting up eCommerce sites.
An yes, then there's Drupal, Laravel, Symfony, and many others, and they're going strong too. Heck, even Joomla is actively developed even though it's probably small enough today to be considered legacy.
