Cannot modify header information - headers already sent error

This error ususally comes when we are working with session,cookies,redirects. If you are getting this error then try to follow the below steps to resolve:

• Session should be started at the begining of the script and it should be written at the very first line.
• There should not be any white spaces before session_start();
• If you are using any MVC framework then make sure there are no whitespaces in controller files after the class is closed (after the close php tag " ?> " tag).

Popular open source shopping carts

Paid Version

Interspire

Magento

X-Cart

Free Version

ZenCart

Oscommerce

VirtueMart

UberCart

WordPress Ecommerce

Magento

PrestaShop

Changing the cart quantity in Interspire Shopping Cart

The Cart "quantity" dropdown when changed to textbox allows only 2 digits that can be entered. To change this I tried the following:

1. Open the template folder that is being used. You can check in "Store Design" section of Admin about the template that you are using.
2. Go to Snippets and open  CartItemQtyText.html file.
3. Search for "maxlength=" and change the number or remove it.
4. Save the changes made.

Please note that the above steps has to be repeated when another template is used.