1 PHP is an open source server-side programming language or scripting language. Server-side means that the program code is executed on the server and not in the browser. A majority of websites on the Internet are written in PHP because the scripting language is particularly well suited for web programming and can be embedded in HTML. PHP can be used to create dynamic websites. This means that a website can look different every time it is called up. For example, depending on where a visitor is coming from, a website can display different information to match the region. PHP is also suitable for creating contact forms or retrieving content from databases. Many content management systems (CMS) and store systems, e.g. TYPO3, WordPress or Shopware, are based on PHP.