77 lines
2.6 KiB
PHP
77 lines
2.6 KiB
PHP
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<?php
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/*
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* Original Author: Simon Jarvis
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* Copyright: 2006 Simon Jarvis
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* Date: 03/08/06
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* Updated: 07/02/07
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* Requirements: PHP 4/5 with GD and FreeType libraries
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* Link: http://www.white-hat-web-design.co.uk/articles/php-captcha.php
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*
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*
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* Modified by: Mythos and Rini
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* Date: 2007-09-10
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* Description: Modified the code and remove use of Session
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details:
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* http://www.gnu.org/licenses/gpl.html
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*
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*
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*/
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include("shared.php");
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class CaptchaSecurityImages {
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var $font = 'monofont.ttf';
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function GenerateImage($width='120',$height='40', $code='') {
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/* font size will be 75% of the image height */
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$font_size = $height * 0.75;
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$image = @imagecreate($width, $height) or die('Cannot initialize new GD image stream');
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/* set the colours */
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imagecolorallocate($image, 255, 255, 255);
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$text_color = imagecolorallocate($image, 20, 40, 100);
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$noise_color = imagecolorallocate($image, 100, 120, 180);
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/* generate random dots in background */
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for( $i=0; $i<($width*$height)/3; $i++ ) {
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imagefilledellipse($image, mt_rand(0,$width), mt_rand(0,$height), 1, 1, $noise_color);
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}
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/* generate random lines in background */
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for( $i=0; $i<($width*$height)/150; $i++ ) {
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imageline($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $noise_color);
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}
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/* create textbox and add text */
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$textbox = imagettfbbox($font_size, 0, $this->font, $code) or die('Error in imagettfbbox function');
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$x = ($width - $textbox[4])/2;
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$y = ($height - $textbox[5])/2;
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imagettftext($image, $font_size, 0, $x, $y, $text_color, $this->font , $code) or die('Error in imagettftext function');
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/* output captcha image to browser */
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header('Content-Type: image/jpeg');
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imagejpeg($image);
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imagedestroy($image);
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}
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}
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$width = isset($_GET['width']) ? $_GET['width'] : '120';
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$height = isset($_GET['height']) ? $_GET['height'] : '40';
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$code = isset($_GET['code']) ? $_GET['code'] : '';
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if (isset($_GET['code']))
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{
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$captcha = new CaptchaSecurityImages();
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$captcha-> GenerateImage($width,$height,wpf_str_decrypt($code));
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}
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