Which content management systems are built with PHP?

The answer

WordPress, Drupal and Joomla are well-known content management systems written in PHP, and several online store platforms are built with it too. A CMS is a ready application with an admin area, users and an extension system, so site owners can edit content without a developer. Themes control appearance and plugins or modules add features. Choose extensions from trusted sources and keep them updated, because outdated ones are a common source of problems.