<?php
if ($_SERVER['REQUEST_METHOD'] == "POST" && isset($_POST) && isset($_POST['action'])) {
include_once 'Luhn.php';
$luhn = new Luhn();
if ($_POST['action'] == "calculate" && isset($_POST['gnumber'])) {
$gnumber = $_POST['gnumber'];
$gresult = $luhn->calculate($gnumber);
} elseif($_POST['action'] == "validate" && isset($_POST['vnumber'])) {
$vnumber = $_POST['vnumber'];
if ($luhn->validate(substr($vnumber, 0, -1), substr($vnumber, -1, 1)) == true) {
$vresult = "Number is valid";
} else {
$vresult = "Number is invalid";
}
}
}
?><!DOCTYPE html>
<html>
<head>
<title>Luhn's algorithm</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<div>
<h1>Check digit calculation</h1>
<form method="post">
<input type="hidden" name="action" value="calculate" />
<label for="gnumber">Number </label><input type="text" style="width: 300px;" id="gnumber" name="gnumber" value="<?php if (isset($gnumber)) echo $gnumber; ?>" /><br />
Result <input type="text" style="width: 300px;" disabled="disabled" value="<?php if (isset($gresult)) echo $gresult; ?>" /><br />
<input type="submit" value="Calculate" />
</form>
<h1>Number validation</h1>
<form method="post">
<p>Number must include check digit - last digit of number is check digit</p>
<input type="hidden" name="action" value="validate" />
<label for="vnumber">Number </label><input type="text" style="width: 300px;" id="vnumber" name="vnumber" value="<?php if (isset($vnumber)) echo $vnumber; ?>" /><br />
Result <input type="text" style="width: 300px;" disabled="disabled" value="<?php if (isset($vresult)) echo $vresult; ?>" /><br />
<input type="submit" value="Calculate" />
</form>
</div>
</body>
</html>
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