<?php
// Example for the PHP simple geometric captcha
session_start();
$sent = (isset($_SESSION['captcha'])) ? TRUE : FALSE;
if ($sent) {
$value = stripslashes(strip_tags(trim($_POST['value'])));
$captchaOk = ($value == $_SESSION['captcha']) ? TRUE : FALSE;
unset($_SESSION['captcha']);
}
?>
<!DOCTYPE html>
<head>
<meta charset="UTF-8" />
<meta name="application-name" content="Simple geometric captcha for PHP" />
<meta name="author" content="Francisco del Aguila. faguila@alboran.net" />
<title>Simple geometric captcha example</title>
</head>
<body>
<?php
if ($sent) {
if ($captchaOk) {
echo 'CORRECT<br/><hr/>';
} else {
echo 'INCORRECT<br/><hr/>';
}
}
?>
<h1>Simple geometric captcha example</h1>
<img src="sgcaptcha.php" style="width:350px;" alt="Captcha" />
<br/>
Input the digits inside the key figures.
<br/>
(Key figures are the ones equal to the black coloured, at the right)
<br/>
<form action="example.php" method="post">
<input type="text" name="value" size="12" maxlength="12" />
<br/>
<input type="submit" value="submit" />
</form>
<br/><br/>
<span style="font-size:.8em;">
Copyright © 2014, Francisco del Aguila<br/>
This software is under the MIT license.<br/>
See contents of file README.txt for more information.
</span>
</body>
</html>
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