Talking Captcha and other Php scripts

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Captcha Talk - Animated Talking Captcha php class

Captcha Code:

A captcha is used to protect forms from non-human submission. A sound captcha allows visitors to listen to this captcha code. This class can be used to add audio to any session based php captcha or as a full working image captcha with a mp3 sound.

Added character mapping between languages ( to make automated audio recognition harder ).
It can use characters from other languages with the same sound also for audio generation.

Mp3 Image Captcha config options:

- Configurable size and character length.
- Set (random) background, shadow and font colors.
- Set (random) .ttf fonts.
- Set (random) background images.
- Validate a visitors IP against DNSBL ( IP blacklists - Optional ).
New options/changes:

- Template based Captcha html to easily adjust to your design
- Now also works with non javascript browsers
- XMLHTTP support for captcha language choice without page refresh
- Added a somewhat faster responding Javascript - Updated: Apr 2009.
( Since this js triggers the browser capability to play the mp3 code there is a little delay
in starting the captcha mp3 the first time )

See the source of the index.php in the download and the class file for the optional config of the Mp3 Image Captcha


<?php
/********************************************************************************
* MP3 captchaform - Put this at the top of your form php page
********************************************************************************/
    /* adjust your path to the mp3captchaform.php location */
include_once('./include/mp3captchaform.php');
    /* init captchaform class */
$mp3captcha= new mp3captcha();
    /* set the current url */
$mp3captcha->url = $_SERVER['SCRIPT_NAME'];
    /* language switch */
$mp3captcha->langswitch();
if (isset($_GET['cfsnd'])) {
    /* output captcha mp3 */
    $mp3captcha->mp3stitch();
} else if (isset($_GET['cfimg'])) {
    /* output captcha image */
    $mp3captcha->image();
}
    /* validate captcha value on post - validation can also be done on a different page 
    set the $mp3captcha= new mp3captcha(); first on a different page */
if ($mp3captcha->post()) { 
    // Do your POST action here
}
?>

<?php
/********************************************************************************
* MP3 captchaform HTML - Echo this in your form
********************************************************************************/
echo $mp3captcha->html(); 
?>

Setup js and php code to use it as addon for an already existing session Captcha
( use the class audio option only )


<?php
    /* Create a page for the mp3 and link to it in the below javascript 
    Set the : var mp3cf to link to this page
    as sample: var mp3cf = "/captcha/index.php";
    */
include_once('./include/mp3captchaform.php');
    /* init captchaform class */

$mp3captcha = new mp3captcha();

$your_captcha_sessionname = "captcha_session_name";
$mp3captcha->session = $your_captcha_sessionname;

    /* create mp3 */
if (isset($_GET['cfsnd'])) {
    $mp3captcha->mp3stitch();
}
?>

<?php
/* validation part */
if (strtolower($_POST['your_post_captcha_form_value']) == strtolower($_SESSION[$your_captcha_sessionname])) {
   echo "It passed";
}
/**
Javascript and Html to use with your form

<script type="text/javascript"><!--
    // url of the Mp3Captcha.php ( to webroot ) 
    // Set the : var mp3cf to link to this page, as sample: 
    var mp3cf = "/captcha/index.php";
    // click delay 1500 = 1.5 sec
    var delaytime = 2500;
    var delayer = false;
    var desoundEmbed = null;

    function captchaMp3() {
        var d = new Date();
        if (delayer) {
            return false;
        }
        delayer = true;
        setTimeout('resetdelay()', delaytime);
        if (!desoundEmbed) {
            desoundEmbed = document.createElement("embed");
            desoundEmbed.setAttribute("src", mp3cf + "?cfsnd=" + d.getTime());
            desoundEmbed.setAttribute("hidden", true);
            desoundEmbed.setAttribute("autostart", true);
            desoundEmbed.setAttribute("type", "audio/x-mpeg");
        } else {
            document.body.removeChild(desoundEmbed);
            desoundEmbed.removed = true;
            desoundEmbed = null;
            desoundEmbed = document.createElement("embed");
            desoundEmbed.setAttribute("src", mp3cf + "?cfsnd=" + d.getTime());
            desoundEmbed.setAttribute("hidden", true);
            desoundEmbed.setAttribute("autostart", true);
            desoundEmbed.setAttribute("type", "audio/x-mpeg");
        }
        desoundEmbed.removed = false;
        document.body.appendChild(desoundEmbed);
        return true;
    }
    
    function resetdelay() {
        delayer = false;
    }

//--></script>

<a href="javascript:captchaMp3();void(0)" onmouseover="window.status=''; return true;">Listen to code</a>


*/
?>

The generated sound file has a small size ( captcha with 4 characters approx 12 to 25kb ) due to mp3 format with high compression. Captcha fonts, size, length and the background images are adjustable and can be set random or fixed ( Configure as you wish.. ).
It's tested on (the latest): Firefox, Opera, Safari, Netscape and Internet Explorer browser ( Win and OSX )

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