Location: PHPKode > scripts > Luta Spam > luta-spam/lutaspam.class.php
<?php
/*******************************************************************************
*   lutaspam v1.2 is a PHP class to make harder for spambots to get emails
*   Copyright (C) 2008  David Sopas Ferreira <coder at davidsopas dot com>
*
*   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 3 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.
*
*   You should have received a copy of the GNU General Public License
*   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*******************************************************************************/

class lutaspam
{
    // Define images for @ and .
    private $image_at = "at.jpg";
    private $image_dot = "dot.jpg";

    // Check DNS records to Internet host name of the given email
    public function verificadns($email)
    {
        list($utilizador, $dominio) = split('@', $email);
        if (!checkdnsrr($dominio, 'MX'))
        {
            // Domain valid
            return false;
        } else
        {
            // Domain not valid
            return true;
        }
    }

    // Function that code and decode the email variable
    public function filtra($filtrar, $opcao)
    {
        $at = $this->image_at;
        $dot = $this->image_dot;
        if ($opcao == 0)
        {
            // Condition to check the format of the email address
            if (preg_match("/^([a-z0-9\+_\-]+)(\.[a-z0-9\+_\-]+)*@([a-z0-9\-]+\.)+[a-z]{2,6}$/ix",
                $filtrar) && $this->verificadns($filtrar) == true)
            {
                // Splits the email in two parts (username and domain)
                $dominio = substr($filtrar, strrpos($filtrar, "@"), strlen($filtrar) - 1);
                $nome = substr($filtrar, 0, strrpos($filtrar, "@"));

                // Replaces the . and @ for respective image
                $dominio = str_replace(".", "<img src='$dot' border='0'>", $dominio);
                $dominio = str_replace("@", "<img src='$at' border='0'>", $dominio);
                $nome = str_replace(".", "<img src='$dot' border='0'>", $nome);
                $filtrado = $nome . $dominio;

            } else
            {
                $filtrado = "ERROR: email not valid!";
            }

        } elseif ($opcao == 1)
        {
            // Replaces the coded email for the original ones
            $filtrado = str_replace("<img src='$at' border='0'>", "@", $filtrar);
            $filtrado = str_replace("<img src='$dot' border='0'>", ".", $filtrado);
        } else
        {
            $filtrado = "ERROR: option not present!";
        }
        return $filtrado;
    }
}
?>
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