Projectname: Simple CAPTCHA class
Version: 0.1
Author: Ver Pangonilo <
[email protected]>
Last modified: 18 May 2006
Copyright (C): 2006 Ver Pangonilo, All Rights Reserved
* GNU General Public License (Version 2, June 1991)
*
* This program 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 2 of the License,
* or (at your option) any later version.
*
* This program 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.
Description:
This class can generate CAPTCHAs for user forms. Parameters can be set on the configuration file including transprency.
Note:
The font "BRADHITC.TTF" is required for the default configuration. This is a common script font for Windows. A replace the default font to suit application.
Usage :
Create a configuration file which contains the following:
<?
session_start();
require_once('class.simplecaptcha.php');
/*
CONFIGURATION STARTS
*/
//Background Image
$config['BackgroundImage'] = "white.png";
//Background Color- HEX
$config['BackgroundColor'] = "FFFC00";
//image height - same as background image
$config['Height']=30;
//image width - same as background image
$config['Width']=100;
//text font size
$config['Font_Size']=20;
//text font style
$config['Font']="BRADHITC.TTF";
//text angle to the left
$config['TextMinimumAngle']=15;
//text angle to the right
$config['TextMaximumAngle']=45;
//Text Color - HEX
$config['TextColor']='000000';
//Number of Captcha Code Character
$config['TextLength']=6;
//Background Image Transparency
// 0 - Not Visible, 100 - Fully Visible
$config['Transparency']=70;
/*
CONFIGURATION ENDS
*/
//Create a new instance of the captcha
$captcha = new SimpleCaptcha($config);
//Save the code as a session dependent string
$_SESSION['string'] = $captcha->Code;
?>
Save this file as captcha.php or any filename you wish to. In the html form,
the usage will be
<img src="PATH_TO/captcha.php" alt="captcha" width="WIDTH" height="HEIGHT" />
Limitations:
1. Initially, it only uses PNG images.
2. The image size should be the same as the background image size.
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