Hey guys, I have a CAPTCHA script that I got from the web, but it is not working. I have two components. One is the .php for the CAPTCHA and the other is the action page that verifies the CAPTCHA exists. Can you tell if both are correct?
Thank you
PHP script for CAPTCHA. Basically, there is an <img src> tag that is set to CaptchaSecurityImages.php and the contents are:
<?php
session_start();
/*
* File: CaptchaSecurityImages.php
* Author: Simon Jarvis
* Copyright: 2006 Simon Jarvis
* Date: 03/08/06
* Updated: 07/02/07
* Requirements: PHP 4/5 with GD and FreeType libraries
* Link: http://www.white-hat-web-design.co.uk/articles/php-captcha.php
*
* 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:
* http://www.gnu.org/licenses/gpl.html
*
*/
class CaptchaSecurityImages {
var $font = 'monofont.ttf';
function generateCode($characters) {
/* list all possible characters, similar looking characters and vowels have been removed */
$possible = '23456789bcdfghjkmnpqrstvwxyz';
$code = '';
$i = 0;
while ($i < $characters) {
$code .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
$i++;
}
return $code;
}
function CaptchaSecurityImages($width='120',$height='40',$characters='6') {
$code = $this->generateCode($characters);
/* font size will be 75% of the image height */
$font_size = $height * 0.75;
$image = @imagecreate($width, $height) or die('Cannot initialize new GD image stream');
/* set the colours */
$background_color = imagecolorallocate($image, 255, 255, 255);
$text_color = imagecolorallocate($image, 20, 40, 100);
$noise_color = imagecolorallocate($image, 100, 120, 180);
/* generate random dots in background */
for( $i=0; $i<($width*$height)/3; $i++ ) {
imagefilledellipse($image, mt_rand(0,$width), mt_rand(0,$height), 1, 1, $noise_color);
}
/* generate random lines in background */
for( $i=0; $i<($width*$height)/150; $i++ ) {
imageline($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $noise_color);
}
/* create textbox and add text */
$textbox = imagettfbbox($font_size, 0, $this->font, $code) or die('Error in imagettfbbox function');
$x = ($width - $textbox[4])/2;
$y = ($height - $textbox[5])/2;
imagettftext($image, $font_size, 0, $x, $y, $text_color, $this->font , $code) or die('Error in imagettftext function');
/* output captcha image to browser */
header('Content-Type: image/jpeg');
imagejpeg($image);
imagedestroy($image);
$_SESSION['security_code'] = $code;
}
}
$width = isset($_GET['width']) ? $_GET['width'] : '120';
$height = isset($_GET['height']) ? $_GET['height'] : '40';
$characters = isset($_GET['characters']) && $_GET['characters'] > 1 ? $_GET['characters'] : '6';
$captcha = new CaptchaSecurityImages($width,$height,$characters);
?>In addition, the action page is:
<?php
session_start();
if(($_SESSION['security_code'] == $_POST['security_code']) && (!empty($_SESSION['security_code'])) )
{
unset($_SESSION['security_code']);
$email=$_REQUEST['email'];
function spamcheck($email)
{
$email=filter_var($email, FILTER_SANITIZE_EMAIL);
if(filter_var($email, FILTER_VALIDATE_EMAIL))
{
return TRUE;
}
else
{
return FALSE;
}
}
if (isset($_REQUEST['email']))
{
$mailcheck = spamcheck($_REQUEST['email']);
if ($mailcheck==FALSE)
{
echo "Please enter a correct email address. Press the Back button to go back.";
}
else
{
$message = "";//Message starts empty
while (list($key, $value) = each($_REQUEST))
{ //Populate variables from GET and POST
${$key} = $value;//this assigns all the variables in GET and POST to their names.
if (strtolower($key) != "submit" && strtolower($key) != "redirect" && strtolower($key) != "phpsessid")//filter out a couple of ones that shouldn't be included in the email
$message .= $key . ": " . stripslashes($value) . "\n\r";//add the rest to the $message variable
}//end Populate Variables
if(mail($recipient, $subject, $message, 'From: ' . $name . ' <' . $email . '>'))//try sending the mail...
{
header("Location: $redirect");//Forward them to the redirect location.
exit();
}
else
{//if the mail didn't send (returned false) report an error.
?>Sorry, there was an error. The form was not submitted. Please click <a href="contactus.php">here</a> to resubmit.
<?php
}
}
}
}
else
{
die("The captcha you entered was incorrect");
}
?>
