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Current File : /var/www/cesa.co.za/php/CaptchaSecurityImages.php

<?php
if (!isset($_SESSION)) {
  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
*
*/

	$font = './monofont.ttf';
	$width = isset($_GET['width']) ? $_GET['width'] : '120';
	$height = isset($_GET['height']) ? $_GET['height'] : '40';
	if (isset($_GET['security_code'])) {
		$code = $_GET['security_code'];
	} else {
		$code = $_SESSION['security_code'];
	}
	
	/* 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, $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, $font , $code) or die('Error in imagettftext function');
	/* output captcha image to browser */
	header('Content-Type: image/jpeg');
	imagejpeg($image);
	imagedestroy($image);

?>