Contao development has started back in 2005. Over the years, a lot of features were added to the framework.

info:: Info

Be aware that this reference guide always describes the latest Contao version. The differences are described in the respective sections of the reference guide.

The Contao API (Application Programming Interface) Reference is split into different sections.

1. Data Configuration Array

   The DCA is one of the most important features in Contao. The backend CRUD functinality is described in a PHP array structure. The DCA is responsible for a unified look in the backend, and one of the first points where you can customize the system.

2. Extending Contao

   This section describes how to add functionality like content elements, frontend modules or custom form fields to the system. Another important parts are hooks, Contao's own event system to extend core functionality.

3. Frontend Output

   Detailed information how to inject custom code to the frontend output, without modifying the fe_page template.

4. Advanced Configuration

   In-depth list of configuration options for the advanced framework users.

5. Constants

   Contao 3 uses a lot of PHP constants to represent state.

6. Functions and static methods

   Descriptions of the available functions and static methods.

7. Classes and Singletons

   A reference guide to the framework classes.

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