在PHP中validation信用卡的最佳方式是什么？
给定一个信用卡号码，没有额外的信息，什么是最好的方式在PHP来确定它是否是一个有效的数字？
现在我需要一些能够与美国运通，Discover，MasterCard和Visa合作的东西，但是如果它也可以与其他types一起使用，这可能会有所帮助。
validation卡号有三个部分：
- 模式 – 它是否符合发行者模式（例如VISA /万事达卡等）
- CHECKSUM – 它是否实际检查总数（例如，“34”之后不只是13个随机数字，使其成为AMEX卡号）
- 真的存在 – 它实际上是否有关联的帐户（如果没有商家帐户，你不太可能得到这个帐户）
模式
- MASTERCARD前缀= 51-55，长度= 16（Mod10校验和）
- VISA前缀= 4，长度= 13或16（Mod10）
- AMEX前缀= 34或37，长度= 15（Mod10）
- Diners Club / Carte Prefix = 300-305,36或38，长度= 14（Mod10）
- 发现前缀= 6011,622126-622925,644-649,65，长度= 16，（Mod10）
- 等等（ 详细的前缀列表 ）
校验
大多数卡片使用Luhnalgorithm进行校验：
在维基百科上描述的Luhnalgorithm
Wikipedia链接上有很多实现的链接，包括PHP：
<? /* Luhn algorithm number checker - (c) 2005-2008 shaman - www.planzero.org * * This code has been released into the public domain, however please * * give credit to the original author where possible. */ function luhn_check($number) { // Strip any non-digits (useful for credit card numbers with spaces and hyphens) $number=preg_replace('/\D/', '', $number); // Set the string length and parity $number_length=strlen($number); $parity=$number_length % 2; // Loop through each digit and do the maths $total=0; for ($i=0; $i<$number_length; $i++) { $digit=$number[$i]; // Multiply alternate digits by two if ($i % 2 == $parity) { $digit*=2; // If the sum is two digits, add them together (in effect) if ($digit > 9) { $digit-=9; } } // Total up the digits $total+=$digit; } // If the total mod 10 equals 0, the number is valid return ($total % 10 == 0) ? TRUE : FALSE; } ?> 从10个正则expression式中你不能没有生活在PHP中 ：
function check_cc($cc, $extra_check = false){ $cards = array( "visa" => "(4\d{12}(?:\d{3})?)", "amex" => "(3[47]\d{13})", "jcb" => "(35[2-8][89]\d\d\d{10})", "maestro" => "((?:5020|5038|6304|6579|6761)\d{12}(?:\d\d)?)", "solo" => "((?:6334|6767)\d{12}(?:\d\d)?\d?)", "mastercard" => "(5[1-5]\d{14})", "switch" => "(?:(?:(?:4903|4905|4911|4936|6333|6759)\d{12})|(?:(?:564182|633110)\d{10})(\d\d)?\d?)", ); $names = array("Visa", "American Express", "JCB", "Maestro", "Solo", "Mastercard", "Switch"); $matches = array(); $pattern = "#^(?:".implode("|", $cards).")$#"; $result = preg_match($pattern, str_replace(" ", "", $cc), $matches); if($extra_check && $result > 0){ $result = (validatecard($cc))?1:0; } return ($result>0)?$names[sizeof($matches)-2]:false; }
示例input：
$cards = array( "4111 1111 1111 1111", ); foreach($cards as $c){ $check = check_cc($c, true); if($check!==false) echo $c." - ".$check; else echo "$c - Not a match"; echo "<br/>"; }
这给了我们
4111 1111 1111 1111 - Visa
最好不要在代码中进行validation。 将卡信息发送到您的支付网关，然后处理他们的回复。 它可以帮助他们检测到欺诈行为，如果你不做任何事情就像Luhn先检查一下 – 让他们看到失败的尝试。
PHP代码
function validateCC($cc_num, $type) { if($type == "American") { $denum = "American Express"; } elseif($type == "Dinners") { $denum = "Diner's Club"; } elseif($type == "Discover") { $denum = "Discover"; } elseif($type == "Master") { $denum = "Master Card"; } elseif($type == "Visa") { $denum = "Visa"; } if($type == "American") { $pattern = "/^([34|37]{2})([0-9]{13})$/";//American Express if (preg_match($pattern,$cc_num)) { $verified = true; } else { $verified = false; } } elseif($type == "Dinners") { $pattern = "/^([30|36|38]{2})([0-9]{12})$/";//Diner's Club if (preg_match($pattern,$cc_num)) { $verified = true; } else { $verified = false; } } elseif($type == "Discover") { $pattern = "/^([6011]{4})([0-9]{12})$/";//Discover Card if (preg_match($pattern,$cc_num)) { $verified = true; } else { $verified = false; } } elseif($type == "Master") { $pattern = "/^([51|52|53|54|55]{2})([0-9]{14})$/";//Mastercard if (preg_match($pattern,$cc_num)) { $verified = true; } else { $verified = false; } } elseif($type == "Visa") { $pattern = "/^([4]{1})([0-9]{12,15})$/";//Visa if (preg_match($pattern,$cc_num)) { $verified = true; } else { $verified = false; } } if($verified == false) { //Do something here in case the validation fails echo "Credit card invalid. Please make sure that you entered a valid <em>" . $denum . "</em> credit card "; } else { //if it will pass...do something echo "Your <em>" . $denum . "</em> credit card is valid"; } }
用法
echo validateCC("1738292928284637", "Dinners");
更多的理论信息可以在这里find：
信用卡validation – 检查数字
校验
我们可以使用以下来validation信用卡。 这对我来说是完美的。
protected function luhn($number) { // Force the value to be a string as this method uses string functions. // Converting to an integer may pass PHP_INT_MAX and result in an error! $number = (string)$number; if (!ctype_digit($number)) { // Luhn can only be used on numbers! return FALSE; } // Check number length $length = strlen($number); // Checksum of the card number $checksum = 0; for ($i = $length - 1; $i >= 0; $i -= 2) { // Add up every 2nd digit, starting from the right $checksum += substr($number, $i, 1); } for ($i = $length - 2; $i >= 0; $i -= 2) { // Add up every 2nd digit doubled, starting from the right $double = substr($number, $i, 1) * 2; // Subtract 9 from the double where value is greater than 10 $checksum += ($double >= 10) ? ($double - 9) : $double; } // If the checksum is a multiple of 10, the number is valid return ($checksum % 10 === 0); } protected function ValidCreditcard($number) { $card_array = array( 'default' => array( 'length' => '13,14,15,16,17,18,19', 'prefix' => '', 'luhn' => TRUE, ), 'american express' => array( 'length' => '15', 'prefix' => '3[47]', 'luhn' => TRUE, ), 'diners club' => array( 'length' => '14,16', 'prefix' => '36|55|30[0-5]', 'luhn' => TRUE, ), 'discover' => array( 'length' => '16', 'prefix' => '6(?:5|011)', 'luhn' => TRUE, ), 'jcb' => array( 'length' => '15,16', 'prefix' => '3|1800|2131', 'luhn' => TRUE, ), 'maestro' => array( 'length' => '16,18', 'prefix' => '50(?:20|38)|6(?:304|759)', 'luhn' => TRUE, ), 'mastercard' => array( 'length' => '16', 'prefix' => '5[1-5]', 'luhn' => TRUE, ), 'visa' => array( 'length' => '13,16', 'prefix' => '4', 'luhn' => TRUE, ), ); // Remove all non-digit characters from the number if (($number = preg_replace('/\D+/', '', $number)) === '') return FALSE; // Use the default type $type = 'default'; $cards = $card_array; // Check card type $type = strtolower($type); if (!isset($cards[$type])) return FALSE; // Check card number length $length = strlen($number); // Validate the card length by the card type if (!in_array($length, preg_split('/\D+/', $cards[$type]['length']))) return FALSE; // Check card number prefix if (!preg_match('/^' . $cards[$type]['prefix'] . '/', $number)) return FALSE; // No Luhn check required if ($cards[$type]['luhn'] == FALSE) return TRUE; return $this->luhn($number); }
luhnalgorithm是一个校验和，可以用来validation很多信用卡格式的格式（还有加拿大的社会保险号码）
维基百科文章也链接到许多不同的实现; 这里是一个PHP的：
http://planzero.org/code/bits/viewcode.php?src=luhn_check.phps
有一个PEAR包处理许多财务数字的validation，也是信用卡validation： http : //pear.php.net/package/Validate_Finance_CreditCard
顺便说一下，这里有一些贝宝的testing信用卡帐号 。
只是抛出一些其他人可能会发现有用的代码片段（而不是PHP代码）。
PYTHON （单行代码;可能不那么高效）
validation：
>>> not(sum(map(int, ''.join(str(n*(i%2+1)) for i, n in enumerate(map(int, reversed('1234567890123452'))))))%10) True >>> not(sum(map(int, ''.join(str(n*(i%2+1)) for i, n in enumerate(map(int, reversed('1234567890123451'))))))%10) False
要返回所需的校验位：
>>> (10-sum(map(int, ''.join(str(n*(i%2+1)) for i, n in enumerate(map(int, reversed('123456789012345')), start=1)))))%10 2 >>> (10-sum(map(int, ''.join(str(n*(i%2+1)) for i, n in enumerate(map(int, reversed('234567890123451')), start=1)))))%10 1
MySQL函数
function“ccc”和“ccd”（信用卡支票和信用卡号码）
请注意，“ccc”函数有一个额外的检查，如果计算的总和为0，返回的结果将始终为FALSE，所以一个全零CC号永远不会validation是正确的（正常情况下，它会validation正确）。 此function可以根据需要添加/删除; 也许有用，取决于具体的要求。
DROP FUNCTION IF EXISTS ccc; DROP FUNCTION IF EXISTS ccd; DELIMITER // CREATE FUNCTION ccc (n TINYTEXT) RETURNS BOOL BEGIN DECLARE x TINYINT UNSIGNED; DECLARE l TINYINT UNSIGNED DEFAULT length(n); DECLARE i TINYINT UNSIGNED DEFAULT l; DECLARE s SMALLINT UNSIGNED DEFAULT 0; WHILE i > 0 DO SET x = mid(n,i,1); IF (li) mod 2 = 1 THEN SET x = x * 2; END IF; SET s = s + x div 10 + x mod 10; SET i = i - 1; END WHILE; RETURN s != 0 && s mod 10 = 0; END; CREATE FUNCTION ccd (n TINYTEXT) RETURNS TINYINT BEGIN DECLARE x TINYINT UNSIGNED; DECLARE l TINYINT UNSIGNED DEFAULT length(n); DECLARE i TINYINT UNSIGNED DEFAULT l; DECLARE s SMALLINT UNSIGNED DEFAULT 0; WHILE i > 0 DO SET x = mid(n,i,1); IF (li) mod 2 = 0 THEN SET x = x * 2; END IF; SET s = s + x div 10 + x mod 10; SET i = i - 1; END WHILE; RETURN ceil(s/10)*10-s; END;
函数可以直接在SQL查询中使用：
mysql> SELECT ccc(1234567890123452); +-----------------------+ | ccc(1234567890123452) | +-----------------------+ | 1 | +-----------------------+ 1 row in set (0.00 sec) mysql> SELECT ccc(1234567890123451); +-----------------------+ | ccc(1234567890123451) | +-----------------------+ | 0 | +-----------------------+ 1 row in set (0.00 sec) mysql> SELECT ccd(123456789012345); +----------------------+ | ccd(123456789012345) | +----------------------+ | 2 | +----------------------+ 1 row in set (0.00 sec) mysql> SELECT ccd(234567890123451); +----------------------+ | ccd(234567890123451) | +----------------------+ | 1 | +----------------------+ 1 row in set (0.00 sec)
这只是为了确保数字是有效的使用一些基本的RegEX模式。
请注意，这不检查数字是否被某人使用。
http://www.roscripts.com/How_to_validate_credit_card_numbers-106.html
