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$sum += $digit; // Usage Example $cardNumber = "49927398716" isValidLuhn($cardNumber) ? "Valid Format" "Invalid Format" Use code with caution. Copied to clipboard 3. Identifying Card Networks (BIN Check) The first 4 to 8 digits of a card are known as the Bank Identification Number (BIN) . You can use regex to identify the issuer: : Starts with MasterCard : Starts with American Express : Starts with getCardType($number) { $patterns = [ "MasterCard" "/^(5[1-5]|222[1-9]|2[3-6]|27[0-1]|2720)/" "/^3[47]/" ($patterns $type => $pattern) (preg_match($pattern, $number)) $type; Use code with caution. Copied to clipboard 4. Moving to Real-Time Checking (APIs)
A checksum formula used to validate various identification numbers. cc checker script php
/** * Validate expiry date (MM/YY or MM/YYYY) */ public function validateExpiry($expiryMonth, $expiryYear) $expiryMonth > 12) return ['valid' => false, 'message' => 'Invalid month']; $sum += $digit; // Usage Example $cardNumber =
Example authorized script (sandbox mode): Identifying Card Networks (BIN Check) The first 4
; $numDigits = strlen($number); $parity = $numDigits % ; $i < $numDigits; $i++) $digit = $number[$i]; // Double every second digit == $parity) $digit *= ) $digit -= ;
