index.php
<?phpinclude 'class-captcha.php';
$captcha1 = new mathcaptcha();
$captcha1->generatekode();
?>
<html>
<head>
<title>bloG-ngelantur</title>
</head>
<body>
<h1>Form Entri Data</h1>
<form method="post" action="cek.php">
<table>
<tr><td>Nama Anda</td><td>:</td><td><input type="text" name="nama"></td></tr>
<tr><td>Email Anda</td><td>:</td><td><input type="text" name="email"></td></tr>
</table>
<p><b>Kode Verifikasi</b></p>
<p>
<? $captcha1->showcaptcha(); ?>
<br>
<input type="text" name="kode">
</p>
<p><input type="submit" name="submit" value="Submit"></p>
</form>
</body>
</html>
cek.php
<?php include 'class-captcha.php';
$captcha1 = new mathcaptcha();
if ($captcha1->resultcaptcha() == $_POST['kode']){
echo "<p><b>Kode Captcha benar.</b></p>";
}els{
echo "<p><b>Kode Captcha salah.</b></p>";
}
echo "<p><a href='index.php'>Back</a></p>"; ?>
class-captcha.php
<?php session_start();
class mathcaptcha
{
private $bil1;
private $bil2;
private $operator;
function initial()
{
$listoperator = array('+', '-', 'x');
$this->bil1 = rand(0, 99);
$this->bil2 = rand(0, 99);
$this->operator = $listoperator[rand(0, 2)];
}
function generatekode()
{
$this->initial();
if ($this->operator == '+') $hasil = $this->bil1 + $this->bil2;
else if ($this->operator == '-') $hasil = $this->bil1 - $this->bil2;
else if ($this->operator == 'x') $hasil = $this->bil1 * $this->bil2;
$_SESSION['kode'] = $hasil;
}
function showcaptcha()
{
echo "Berapa hasil dari ".$this->bil1." ".$this->operator." ".$this->bil2." ? ";
}
function resultcaptcha()
{
return $_SESSION['kode'];
}
} ?>
Download sample
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