86 lines
No EOL
3.3 KiB
PHP
86 lines
No EOL
3.3 KiB
PHP
<?php
|
|
session_start();
|
|
/*
|
|
* File: CaptchaSecurityImages.php
|
|
* Author: Simon Jarvis
|
|
* Edited By : ArslanHassan
|
|
* Copyright: 2006 Simon Jarvis
|
|
* Date: 03/08/06
|
|
* Updated: 09/13/08
|
|
* 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
|
|
*
|
|
*/
|
|
define('FONTPATH','./captcha/img/fonts/monofont.ttf');
|
|
class CaptchaSecurityImages {
|
|
|
|
var $font = FONTPATH;
|
|
|
|
function generateCode($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, 0, 0, 0);
|
|
$noise_color = imagecolorallocate($image, 226, 82, 207);
|
|
$noise_color1 = imagecolorallocate($image, 64, 179, 255);
|
|
$noise_color2 = imagecolorallocate($image, 255 ,204, 190);
|
|
|
|
/* generate random dots in background */
|
|
for( $i=0; $i<($width*$height)/250; $i++ ) {
|
|
imageellipse($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $noise_color2);
|
|
}
|
|
/* generate random dots in background */
|
|
for( $i=0; $i<($width*$height)/150; $i++ ) {
|
|
imagedashedline($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $noise_color1);
|
|
}
|
|
/* generate random lines in background */
|
|
for( $i=0; $i<($width*$height)/150; $i++ ) {
|
|
|
|
imagedashedline($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 , $code) or die('Error in imagettftext function');
|
|
|
|
/* output captcha image to browser */
|
|
imagejpeg($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);
|
|
?>
|