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PHP CAPTCHA Script

branch: master
README.md

Name:

Securimage - A PHP class for creating captcha images and audio with many options.

Version:

3.5.2

Author:

Drew Phillips drew@drew-phillips.com

Download:

The latest version can always be found at phpcaptcha.org

Documentation:

Online documentation of the class, methods, and variables can be found at http://www.phpcaptcha.org/Securimage_Docs/

Requirements:

  • PHP 5.2 or greater
  • GD 2.0
  • FreeType (Required, for TTF fonts)
  • PDO (if using Sqlite, MySQL, or PostgreSQL)

Synopsis:

Within your HTML form

<form metod="post" action="">
.. form elements

<div>
    <?php
        require_once 'securimage.php';
        echo Securimage::getCaptchaHtml();
    ?>
</div>
</form>

Within your PHP form processor

require_once 'securimage.php';

// Code Validation

$image = new Securimage();
if ($image->check($_POST['captcha_code']) == true) {
  echo "Correct!";
} else {
  echo "Sorry, wrong code.";
}

Description:

What is Securimage?

Securimage is a PHP class that is used to generate and validate CAPTCHA images.

The classes uses an existing PHP session or creates its own if none is found to store the CAPTCHA code. In addition, a database can be used instead of session storage.

Variables within the class are used to control the style and display of the image. The class uses TTF fonts and effects for strengthening the security of the image.

It also creates audible codes which are played for visually impared users.

Copyright:

Copyright (c) 2014 Drew Phillips
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

- Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.

Licenses:

WavFile.php

The WavFile.php class used in Securimage by Drew Phillips and Paul Voegler
is used under the BSD License.  See WavFile.php for details.
Many thanks to Paul Voegler (http://www.voegler.eu/) for contributing to
Securimage.

Flash code for Securimage

Flash code created by Age Bosma & Mario Romero (animario@hotmail.com) Many thanks for releasing this to the project!


HKCaptcha

Portions of Securimage contain code from Han-Kwang Nienhuys' PHP captcha

Han-Kwang Nienhuys' PHP captcha
Copyright June 2007

This copyright message and attribution must be preserved upon
modification. Redistribution under other licenses is expressly allowed.
Other licenses include GPL 2 or higher, BSD, and non-free licenses.
The original, unrestricted version can be obtained from
http://www.lagom.nl/linux/hkcaptcha/

AHGBold.ttf

AHGBold.ttf (AlteHaasGroteskBold.ttf) font was created by Yann Le Coroller
and is distributed as freeware.

Alte Haas Grotesk is a typeface that look like an helvetica printed in an
old Muller-Brockmann Book.

These fonts are freeware and can be distributed as long as they are
together with this text file. 

I would appreciate very much to see what you have done with it anyway.

yann le coroller 
www.yannlecoroller.com
yann@lecoroller.com

PopForge Flash Library

Portions of securimage_play.swf use the PopForge flash library for playing audio

/**
 * Copyright(C) 2007 Andre Michelle and Joa Ebert
 *
 * PopForge is an ActionScript3 code sandbox developed by Andre Michelle
 * and Joa Ebert
 * http://sandbox.popforge.de
 *
 * PopforgeAS3Audio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * PopforgeAS3Audio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>
 */

Graphics

Some graphics used are from the Humility Icon Pack by WorLord

 License: GNU/GPL (http://findicons.com/pack/1723/humility)
 http://findicons.com/icon/192558/gnome_volume_control
 http://findicons.com/icon/192562/gtk_refresh

Background noise sound files are from SoundJay.com

http://www.soundjay.com/tos.html

 All sound effects on this website are created by us and protected under
 the copyright laws, international treaty provisions and other applicable
 laws. By downloading sounds, music or any material from this site implies
 that you have read and accepted these terms and conditions:

 Sound Effects
 You are allowed to use the sounds free of charge and royalty free in your
 projects (such as films, videos, games, presentations, animations, stage
 plays, radio plays, audio books, apps) be it for commercial or
 non-commercial purposes.

 But you are NOT allowed to
 - post the sounds (as sound effects or ringtones) on any website for
   others to download, copy or use
 - use them as a raw material to create sound effects or ringtones that
   you will sell, distribute or offer for downloading
 - sell, re-sell, license or re-license the sounds (as individual sound
   effects or as a sound effects library) to anyone else
 - claim the sounds as yours
 - link directly to individual sound files
 - distribute the sounds in apps or computer programs that are clearly
   sound related in nature (such as sound machine, sound effect
   generator, ringtone maker, funny sounds app, sound therapy app, etc.)
   or in apps or computer programs that use the sounds as the program's
   sound resource library for other people's use (such as animation
   creator, digital book creator, song maker software, etc.). If you are
   developing such computer programs, contact us for licensing options.

 If you use the sound effects, please consider giving us a credit and
 linking back to us but it's not required.
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