PHP Classes

Check spam: Generate and validate CAPTCHA verification images

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Version License PHP version Categories
checkspam 1.6GNU General Publi...5.0HTML, PHP 5, Graphics, Validation
Description 

Author

Giuseppe Leone

This package can be used to generate and validate CAPTCHA validation images.

It can create an image in the PNG format displaying a random text. The text is stored in a session variable for later verification.

The class can also generate HTML to display the verification image and the inputs of a form on which the user must type the text in the image.

The class can verify whether the submitted form input text matches the text in the image.

All actions are recorded in a log stored as a class variable.

Picture of Giuseppe Leone
Name: Giuseppe Leone <contact>
Classes: 1 package by
Country: Italy Italy

 

Details

NAME

	CheckSpam - a simple Class that helps you to prevent the spam attack to your website.
	It provide to generate two types of verification:
	 
	 1 - Text (Customizable style in CSS like);
	 2 - Graphic (Using the GD 2.x PHP Library).

SYNOPSIS

	# THE FORM:
	
	<?php
	define('CHECKSPAM_DIR','../../checkspam/');
	require_once(CHECKSPAM_DIR.'checkspam.class.php');

	$cs = new checkspam;

	$cs->init_session();

	$cs->exec_checkspam(0); // Text mode verification
	?>
	<!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>
			<title>checkspam - First example</title>
		</head>
		<body>
			<h1>SIMPLE TEXT VERIFICATION:</h1>
			<form method="post" action="register.php">
				<table width="60%" border="1">
					<tr>
						<td width="30%">Name:</td>
						<td width="70%"><input type="text" name="txt_name" /></td>
					</tr>
					<tr>
						<td>Security code: <?php $cs->print_imagetext(); ?></td>
						<td><?php $cs->print_input(); ?></td>
					</tr>
					<tr>
						<td colspan="2" align="center"><input type="submit" value="send data" /></td>
					</tr>
				</table>
			</form>
		<body>
	</html>
	
	# THE VERIFICATION:
	
	<?php
	define('CHECKSPAM_DIR','../../checkSpam/');
	require_once(CHECKSPAM_DIR.'checkspam.class.php');

	$cs = new checkspam;

	$cs->init_session();

	if($cs->verify($_POST['secretcode'])){
		echo "Valid code specified !";
	}else{
		echo "NO valid code specified !";
	}
	?>

DESCRIPTION

GETTING STARTED

IMPORTANT
	
	# About the Graphic Mode #
	
	If the Graphic mode is enable,
	the "checkspam/images/ directory must be writable by everyone ( chmod 777 )
	
	# How to use other fonts #
	
	A new font image can be uploaded into the font's directory "checkspam/font";
	IMPORTANT NOTE: The new font PNG image must have the same color and character position of the other font image already present into the directory.

COPYRIGHT
	
	Copyright(c) 2006 joseph@masterdrive.it. All rights reserved.
	This software is released under the GNU General Public License.
	http://www.gnu.org

Screenshots (1)  
  • screenshot/graphic_verification.png
  Files folder image Files (21)  
File Role Description
Files folder imagecheckspam (1 file, 2 directories)
Files folder imagesamples (5 directories)
Plain text file AUTHORS Doc. Authors file
Plain text file INSTALL Doc. Installation file
Plain text file LICENSE Lic. License file
Plain text file README Doc. Readme file
Plain text file VERSION Doc. Version file

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