Which Ecommerce Script Should I Use?
Is there any cms written in php have support for managing color, size & stock of item.
and also if possible image of the product base on color?
It is standard on magento, no plugins or modules needed. Each variation is saved as a separate non-visable product with a main configurable product that groups them together. Stock is tracked for each individual non-visible product.
Here's a screencast that shows it in action.