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一个用于验证所有类型的信用卡的PHP类，这个PHP类比较完整，可以用于验证各种不同的信用卡，针对信用卡的卡号的通用规则进行了验证，同时对不同类型的信用卡进行了针对性的识别。

代码接受一个信用卡号码和有效日期，如果两者都有效，则返回TRUE,否则返回FALSE。本插件接受以下参数：
$number 表示信用卡号码的一个字符串
$expiry 信用卡有效日期，采用07/12或0712这样的格式

/**
 * 一个用于验证所有类型的信用卡的PHP类
 *
 * @param 
 * @arrange 512-笔记网： 512Pic.com
 **/
<?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,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,1) * 2;
	  $chksum += $d < 10 ? $d : $d - 9;
   }
   if ($chksum % 10 != 0) return FALSE;
   if (mktime(0,substr($expiry,2),date("t"),2,2)) < time()) return FALSE;
   return TRUE;
}
?>
/***   来自编程之家 jb51.cc（jb51.cc）   ***/