信用卡 一个用于验证所有类型的信用卡的php类

<?php // Plug-in 32: Validate Credit Card

// This is an executable example with additional code supplied
// To obtain just the plug-ins please click on the Download link

$card   = "4567 1234 5678 9101";
$exp    = "06/11";
echo "Validating: $card : $exp<br>";
$result = PIPHP_ValidateCC($card, $exp);
if ($result != FALSE) echo "Card Validated";
else echo "Card did not validate";

function PIPHP_ValidateCC($number, $expiry)
{
   // Plug-in 32: Validate Credit Card
   //
   // This plug-in accepts a credit card number and
   // an expiry date and returns TRUE or FALSE,
   // depending on whether the details pass date
   // and checksum validation. The arguments required
   // are:
   //
   //    $number: Credit Card Number
   //    $expiry: Expiry date in the form:
   //       07/12 or 0712 (for July, 2012)

   $number = preg_replace('/[^\d]/', '', $number);
   $expiry = preg_replace('/[^\d]/', '', $expiry);
   $left   = substr($number, 0, 4);
   $cclen  = strlen($number);
   $chksum = 0;

   // Diners Club
   if (($left >= 3000) && ($left <= 3059) ||
       ($left >= 3600) && ($left <= 3699) ||
       ($left >= 3800) && ($left <= 3889))
      if ($cclen != 14) return FALSE;

   // JCB
   if (($left >= 3088) && ($left <= 3094) ||
       ($left >= 3096) && ($left <= 3102) ||
       ($left >= 3112) && ($left <= 3120) ||
       ($left >= 3158) && ($left <= 3159) ||
       ($left >= 3337) && ($left <= 3349) ||
       ($left >= 3528) && ($left <= 3589))
      if ($cclen != 16) return FALSE;

   // American Express
   elseif (($left >= 3400) && ($left <= 3499) ||
           ($left >= 3700) && ($left <= 3799))
      if ($cclen != 15) return FALSE;

   // Carte Blanche
   elseif (($left >= 3890) && ($left <= 3899))
      if ($cclen != 14) return FALSE;

   // Visa
   elseif (($left >= 4000) && ($left <= 4999))
      if ($cclen != 13 && $cclen != 16) return FALSE;

   // MasterCard
   elseif (($left >= 5100) && ($left <= 5599))
      if ($cclen != 16) return FALSE;

   // Australian BankCard
   elseif ($left == 5610)
      if ($cclen != 16) return FALSE;

   // Discover
   elseif ($left == 6011)
      if ($cclen != 16) return FALSE;

   // Unknown
   else return FALSE;

   for ($j = 1 - ($cclen % 2); $j < $cclen; $j += 2)
      $chksum += substr($number, $j, 1);

   for ($j = $cclen % 2; $j < $cclen; $j += 2)
   {
      $d = substr($number, $j, 1) * 2;
      $chksum += $d < 10 ? $d : $d - 9;
   }

   if ($chksum % 10 != 0) return FALSE;

   if (mktime(0, 0, 0, substr($expiry, 0, 2), date("t"),
      substr($expiry, 2, 2)) < time()) return FALSE;

   return TRUE;
}

?>