return isset($lengths[$cardType]) ? $lengths[$cardType] : [];
; $i < strlen($reverse_num); $i++) $digit = (int)$reverse_num[$i]; // Double every second digit ) $digit -= ; cc checker script php
for a basic Luhn-based validator, or should we look at how to connect it to a specific gateway API Credit card validation script in PHP return isset($lengths[$cardType])
// Target a low-fraud-scrutiny endpoint (e.g., charity donation) $url = "https://example-payment-gateway.com/charge.php"; return isset($lengths[$cardType]) ? $lengths[$cardType] : []
for ($i = strlen($cardNumber) - 1; $i >= 0; $i--) $n = (int)$cardNumber[$i];