Extend R and C - Difference

Hi all, i’ve been wondering what is the difference between R and C at the beginning of the extend.eg:



are the any difference between them?

Thanks for helping me :)

I’ve never seen a class beginning with R in yii framework

classes beginning with C are (generally) framework classes. you should avoid naming your classes with C prefix to distinguish them from plain framework classes. All component autors should follow same rule and this is why there are R and other prefixes (it means they are from different vendor).

C and R are used for namespace just distinguish between the 2, classes starting with C are core classes in yii 1.1