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99 lines
3.2 KiB
PHP
99 lines
3.2 KiB
PHP
<?php
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/**
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* Static Captcha Example Script
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* 2012-04-18
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* @version 3.2RC2 (April 2012)
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*
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* The static captcha exposes an easy to use interface that applications can
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* use to generate captcha challenges and validate them by a unique ID. A
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* captcha image can be associated with an ID and no PHP sessions are required.
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* The captcha ID can be stored in a SQLite database by Securimage.
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*
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* Tip: To give the user a refresh captcha button, use Ajax to request a new ID,
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* update the hidden form input with the new captcha ID, and update the image source
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* to securimage_show.php providing the captcha ID.
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*/
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// set debugging
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error_reporting(E_ALL);
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ini_set('display_errors', 1);
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// defines Securimage class
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require_once '../securimage.php';
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// get the captcha ID from the url (if supplied)
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$captchaId = (isset($_GET['id'])) ? $_GET['id'] : '';
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// if the validate option is set
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if (isset($_GET['validate'])) {
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// get the user input of the captcha code
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$input = (isset($_GET['input'])) ? $_GET['input'] : '';
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// call Securimage::checkCaptchaId to validate input
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// returns true if the code and id are a valid pair, false if not
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if (Securimage::checkByCaptchaId($captchaId, $input) == true) {
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echo "<h2>Success</h2>"
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."<span style='color: #33cc00'>The captcha code entered was correct!</span>"
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."<br /><br />";
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} else {
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echo "<h2>Incorrect Code</h2>"
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."<span style='color: #f00'>Incorrect captcha code, try again.</span>"
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."<br /><br />";
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}
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} else if (isset($_GET['display'])) {
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// display the captcha with the supplied ID from the URL
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// construct options specifying the existing captcha ID
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// also tell securimage not to start a session
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$options = array('captchaId' => $captchaId,
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'no_session' => true);
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$captcha = new Securimage($options);
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// show the image, this sends proper HTTP headers
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$captcha->show();
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exit;
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}
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// generate a new captcha ID and challenge
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$captchaId = Securimage::getCaptchaId();
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// output the captcha ID, and a form to validate it
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// the form submits to itself and is validated above
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echo <<<EOD
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<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
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<title>Static Captcha Example</title>
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</head>
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<body>
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<h2>Static Captcha Example</h2>
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<div>
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Synopsis:
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<ul>
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<li>Request new captchaId using <em>Securimage::getCaptchaId()</em></li>
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<li>Display form with hidden field containing captchaId</li>
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<li>Display captcha image passing the captchaId to the image</li>
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<li>Validate captcha input against captchaId using <em>Securimage::checkByCaptchaId()</em></li>
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</ul>
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</div>
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<p> </p>
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<div>
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Captcha ID: $captchaId<br /><br />
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<img src="{$_SERVER['PHP_SELF']}?display&id=$captchaId" alt="Captcha Image" /><br />
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<form method="get" action="{$_SERVER['PHP_SELF']}">
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<input type="hidden" name="validate" value="1" />
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<input type="hidden" name="id" value="$captchaId" />
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Enter Code:
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<input type="text" name="input" value="" />
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<input type="submit" name="submit" value="Check Captcha" />
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</form>
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</div>
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</body>
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</html>
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EOD;
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