Does the Luhn algorithm work for all mainstream credit cards? (Discover, Visa, Mastercard, Amex)

Question

Reference: Luhn Algorithm

The Luhn Algorithm is a great way to quickly verify that the user typed their CC # in correctly.

However, I am concerned that there

Answer 1

Yes -- it works for all mainstream card types.

I have a custom PHP class to handle card data that was compiled from various "validate card number" and alike functions from few programming languages + information from Wikipedia & some Payment Processing systems. It successfully validates test card numbers (every payment system has few of such numbers) for these card types:

• VISA debit / credit
• VISA Electron
• VISA Delta
• MasterCard
• AMEX
• Maestro
• Switch
• Solo
• Diners Club
• Discover
• JCB