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<?php
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// $Id: captcha.php 287 2006-01-23 22:28:19Z stefan $
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/*
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Website Baker Project <http://www.websitebaker.org/>
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Copyright (C) 2004-2005, Ryan Djurovich
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Website Baker is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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Website Baker 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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You should have received a copy of the GNU General Public License
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along with Website Baker; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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Captcha generator
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This file generates a captcha image.
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Credits to http://php.webmaster-kit.com/ for the original code.
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*/
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require_once("../config.php");
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if(extension_loaded('gd') AND function_exists('imageCreateFromJpeg') AND isset($_SESSION['captcha'])) {
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$image = imagecreate(120, 30);
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$white = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
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$gray = imagecolorallocate($image, 0xC0, 0xC0, 0xC0);
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$darkgray = imagecolorallocate($image, 0x50, 0x50, 0x50);
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srand((double)microtime()*1000000);
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for($i = 0; $i < 30; $i++) {
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$x1 = rand(0,120);
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$y1 = rand(0,30);
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$x2 = rand(0,120);
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$y2 = rand(0,30);
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imageline($image, $x1, $y1, $x2, $y2 , $gray);
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}
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for ($i = 0; $i < 5; $i++) {
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$fnt = rand(3,5);
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$x = $x + rand(12 , 20);
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$y = rand(7 , 12);
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imagestring($image, $fnt, $x, $y, substr($_SESSION['captcha'], $i, 1), $darkgray);
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}
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// start buffering for size determination
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ob_start();
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// add no cache headers
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header("Expires: Mon, 1 Jan 1990 05:00:00 GMT");
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header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
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header("Cache-Control: no-store, no-cache, must-revalidate");
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header("Cache-Control: post-check=0, pre-check=0", false);
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header("Pragma: no-cache");
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header("Content-type: image/png");
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// Make image
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imagepng($image);
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// Fetch length
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header("Content-Length: " . ob_get_length());
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// send image and turn off buffering
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ob_end_flush();
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// clear memory
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imagedestroy($image);
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}
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?>
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