PHP Classes Introduction
In the folder application/base/classes is a collection of folders and each folder contains the php classes. These classes are used for different scopes and the folders are used like categories.
In this category PHP Classes you will find information about some php classes which you can use in your apps, themes, plugins and components. I won't provide information about all classes because most of them are used inside the general Core's functions.
To use the php classes you have to add the namespace of the class in your php file and use it according the documentation provided in this category.
All php classes from application/base/classes i've written 100%.