Anti Spam Scrips

Anti Spam scripts that will protect your forms to be submited by spammer's bots. Captcha (an acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart" ) is the most common and effertive spa, protction technique
Captcha is a type of challenge-response test used in computing to determine whether or not the user is human or spammer's robot. A CAPTCHA involves one computer (a server) which asks a user to complete a test. While the computer is able to generate and grade the test, it is not able to solve the test on its own. Because computers are unable to solve the CAPTCHA, any user entering a correct solution is presumed to be human.
Protect your forms from spammers with these free php spam protection scrips

I. DESCRIPTION

Image Validator is a GPL CAPTCHA php script to stop spam on any form: comment areas, sign-ups, shopping carts - any area of your website where you fear the evil spammers may target.


II. REQUIREMENTS

1. Apache 1 or 2
2. PHP 4 or 5
3. GD 2 with truetype support


III. INSTALLATION

0. Unpack this package.
1. You may edit _config.php file located in imgval directory.
2. You may copy some TrueType fonts in imgval/fonts directory.
2. Upload or copy imgval directory to browsable directory.
3. Open imgval/index.php in your browser for testing.


IV. INTEGRATION NOTES

In tag, 'src' parametter should be linked with imgval/code.php.

Example: .

To prevent cache images you may add some unique parameter.

Example: " />

Your should start a session in the response PHP file. In the valid action
PHP source code you should verify MD5 sum of the input-code-field-value
with session variable named __img_code__

Example:

if (md5($_POST['code']) == $_SESSION['__img_code__'])
echo "Valid code";
else
echo "Invalid code";

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