This script is designed for developers building checkout systems who need to sanitize user input before sending it to a payment processor.
Creating a functional "CC Checker" script that actually validates cards against banking networks (using the Luhn algorithm) and checks card metadata (using Binlist) is a common programming exercise. cc checker script php best
function mask_pan($pan) $len = strlen($pan); if ($len <= 4) return str_repeat('*', $len); return str_repeat('*', max(0, $len - 4)) . substr($pan, -4); This script is designed for developers building checkout