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
<?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; } ?>