I'm planning to create a shopping website and want to create it quickly. I'm looking for framework which can provide me good backend(admin section, like joomla provide). Also, I can customize my webpages easily, should not require too much time to understand the framework. I have tried Joomla and when I saw the code it was complex. It would be great if framework provides me the ready made cart section, however, I can modify it according to my requirement. Please suggest me if any easy framework exists in php or in any other language.
You want the holy grail of online-shop-systems? Easy to build jet very powerfull?
Sorry mate, but that does not exist. You can either go the simple way. Have an easy to set up system that can't do a lot or you have a powerfull system with a lot of possibilitys that's complex.
Beside that SO is not ment to give opionos but to solve programming-problems and errors. Therefor your question doesn't fit here. Esp. if you show no effort about what you have looked up yourself this far.
The answer to your question would be Magento. It has all the features which are required by a shopping cart.