Mini Shell
<?php session_start(); ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<meta name="Author" content="Jose Rodriguez" />
<title>Captcha test</title>
<style type="text/css">
body { font-family: sans-serif; font-size: 0.8em; padding: 20px; }
#result { border: 1px solid green; width: 300px; margin: 0 0 35px 0; padding: 10px 20px; font-weight: bold; }
#change-image { font-size: 0.8em; }
</style>
</head>
<body onload="document.getElementById('captcha-form').focus()">
<?php
/** Validate captcha */
if (!empty($_REQUEST['captcha'])) {
if (empty($_SESSION['captcha']) || trim(strtolower($_REQUEST['captcha'])) != $_SESSION['captcha']) {
$captcha_message = "Invalid captcha";
$style = "background-color: #FF606C";
} else {
$captcha_message = "Valid captcha";
$style = "background-color: #CCFF99";
}
$request_captcha = htmlspecialchars($_REQUEST['captcha']);
echo <<<HTML
<div id="result" style="$style">
<h2>$captcha_message</h2>
<table>
<tr>
<td>Session CAPTCHA:</td>
<td>{$_SESSION['captcha']}</td>
</tr>
<tr>
<td>Form CAPTCHA:</td>
<td>$request_captcha</td>
</tr>
</table>
</div>
HTML;
unset($_SESSION['captcha']);
}
?>
<p><strong>Write the following word:</strong></p>
<form method="GET">
<img src="captcha.php" id="captcha" /><br/>
<!-- CHANGE TEXT LINK -->
<a href="#" onclick="
document.getElementById('captcha').src='captcha.php?'+Math.random();
document.getElementById('captcha-form').focus();"
id="change-image">Not readable? Change text.</a><br/><br/>
<input type="text" name="captcha" id="captcha-form" autocomplete="off" /><br/>
<input type="submit" />
</form>
</body>
</html>