A full stack developer is a programmer who has the skills and knowledge to work on both the front-end and back-end of web development. This means they can work with both client-side technologies, such as HTML, CSS, and JavaScript, and server-side technologies, such as PHP, Python, Ruby, or Java.

PHP is a server-side scripting language that is commonly used for web development. It is often used in combination with a web framework, such as Laravel, Yii, or Symfony, which provide a set of tools and libraries for building web applications quickly and efficiently. These frameworks help developers to write code that is reusable, maintainable, and secure.

WordPress is a popular content management system (CMS) that is used by many websites. It is built using PHP and provides a user-friendly interface for managing website content. Full stack developers who work with WordPress may be responsible for customizing and extending the platform using plugins and themes, as well as developing custom functionality using PHP and other web technologies.

Overall, full stack developers who work with PHP, Laravel, Yii, Symfony, and WordPress have a wide range of skills and knowledge related to web development. They are able to work on both the front-end and back-end of web applications, and are able to develop custom functionality using a variety of programming languages and frameworks.