一个通用的信用卡验证的PHP类 信用卡验证解决方案（PHP版） 3.5版
描述 信用卡验证解决方案?采用了四步过程，以确保信用卡号码键入正确。这个程序准确地从美国运通，澳大利亚银行卡，点菜布拉切，大莱卡，发现/诺瓦斯，JCB，MasterCard和Visa卡检查。 欲了解更多信息，请阅读代码本身的注释。
安装说明 选择所指出的，下面的两行之间的文本。 复制的文本。 打开一个文本编辑器。 粘贴的文本。 保存该文件。当保存，确保： 它保存在网络服务器上的目录，并 与你的服务器会识别需要通过PHP解析扩展的名字。 要看到它在行动，在你的网页browswer打开该文件。
/**
* 一个通用的信用卡验证PHP类
*
* @param
* @arrange 512-笔记网： www.512Pic.com
**/
function CCValidationSolution ($Number) {
global $CardName;
# 1) Get rid of spaces and non-numeric characters.
$Number = OnlyNumericSolution($Number);
# 2) Do the first four digits fit within proper ranges?
# If so,who's the card issuer and how long should the number be?
$NumberLeft = substr($Number,4);
$NumberLength = strlen($Number);
if ($NumberLeft >= 3000 and $NumberLeft <= 3059) {
$CardName = "Diners Club";
$ShouldLength = 14;
} elseif ($NumberLeft >= 3600 and $NumberLeft <= 3699) {
$CardName = "Diners Club";
$ShouldLength = 14;
} elseif ($NumberLeft >= 3800 and $NumberLeft <= 3889) {
$CardName = "Diners Club";
$ShouldLength = 14;
} elseif ($NumberLeft >= 3400 and $NumberLeft <= 3499) {
$CardName = "American Express";
$ShouldLength = 15;
} elseif ($NumberLeft >= 3700 and $NumberLeft <= 3799) {
$CardName = "American Express";
$ShouldLength = 15;
} elseif ($NumberLeft >= 3528 and $NumberLeft <= 3589) {
$CardName = "JCB";
$ShouldLength = 16;
} elseif ($NumberLeft >= 3890 and $NumberLeft <= 3899) {
$CardName = "Carte Blache";
$ShouldLength = 14;
} elseif ($NumberLeft >= 4000 and $NumberLeft <= 4999) {
$CardName = "Visa";
if ($NumberLength > 14) {
$ShouldLength = 16;
} elseif ($NumberLength < 14) {
$ShouldLength = 13;
} else {
echo "<br /><em>The Visa number entered,$Number,in is 14 digits long.<br />Visa cards usually have 16 digits,though some have 13.<br />Please check the number and try again.</em><br />n";
return FALSE;
}
} elseif ($NumberLeft >= 5100 and $NumberLeft <= 5599) {
$CardName = "MasterCard";
$ShouldLength = 16;
} elseif ($NumberLeft == 5610) {
$CardName = "Australian BankCard";
$ShouldLength = 16;
} elseif ($NumberLeft == 6011) {
$CardName = "Discover/Novus";
$ShouldLength = 16;
} else {
echo "<br /><em>The first four digits of the number entered are $NumberLeft. <br />If that's correct,we don't accept that type of credit card.<br />If it's wrong,please try again.</em><br />n";
return FALSE;
}
# 3) Is the number the right length?
if ($NumberLength <> $ShouldLength) {
$Missing = $NumberLength - $ShouldLength;
if ($Missing < 0) {
echo "<br /><em>The $CardName number entered,is missing " . abs($Missing) . " digit(s).<br />Please check the number and try again.</em><br />n";
} else {
echo "<br /><em>The $CardName number entered,has $Missing too many digit(s).<br />Please check the number and try again.</em><br />n";
}
return FALSE;
}
# 4) Does the number pass the Mod 10 Algorithm Checksum?
if (Mod10Solution($Number) == TRUE) {
return TRUE;
} else {
echo "<br /><em>The $CardName number entered,is invalid.<br />Please check the number and try again.</em><br />n";
return FALSE;
}
}
function OnlyNumericSolution ($Number) {
# Remove any non numeric characters.
# Ensure number is no more than 19 characters long.
return substr( ereg_replace( "[^0-9]","",$Number),19);
}
function Mod10Solution ($Number) {
$NumberLength = strlen($Number);
$Checksum = 0;
# Add even digits in even length strings
# or odd digits in odd length strings.
for ($Location = 1 - ($NumberLength % 2); $Location < $NumberLength; $Location += 2) {
$Checksum += substr($Number,$Location,1);
}
# Analyze odd digits in even length strings
# or even digits in odd length strings.
for ($Location = ($NumberLength % 2); $Location < $NumberLength; $Location += 2) {
$Digit = substr($Number,1) * 2;
if ($Digit < 10) {
$Checksum += $Digit;
} else {
$Checksum += $Digit - 9;
}
}
# Is the checksum divisible by ten?
return ($Checksum % 10 == 0);
}
# ----------- BEGIN SAMPLE USER INTERFACE SECTION ------------
#
# This section provides a simple sample user interface for the
# Credit Card Validation functions. It generates an HTML form
# where you enter a card number to check.
#
# If a number has been posted by the form,check it.
if ( isset($Number) ) {
# Get rid of spaces and non-numeric characters in posted
# numbers so they display correctly on the input form.
$Number = OnlyNumericSolution($Number);
if (CCValidationSolution($Number) == TRUE) {
echo "<br />The $CardName number entered,<em>is</em> valid.<br />n";
}
} else {
$Number = "";
}
# Setup an input form. Posting it calls this page again.
echo "<form method="post" action="$REQUEST_URI">n";
echo "<br />Credit Card Number: <input type="text" name="Number" value="$Number">n";
echo "<input type="Submit" name="submitr" value="Check its Validity">n";
echo "</form><br />n";
/*** 来自编程之家 jb51.cc（jb51.cc） ***/