<?php
session_start();
/*
This Animated Gif Captcha system is brought to you courtesy of ...
josh@betteradv.com ==> Josh Storz
http://www.querythe.net/Animated-Gif-Captcha/ ==> Download Current Version
OOP (PHP 4 & 5) Interface by ...
krakjoe@krakjoe.info ==> J Watkins
The GIFEncoder class was written by ...
http://gifs.hu ==> László Zsidi
http://www.phpclasses.org/browse/package/3163.html ==> Download Current Version
This file is part of QueryThe.Net's AnimatedCaptcha Package.
QueryThe.Net's AnimatedCaptcha is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
QueryThe.Net's AnimatedCaptcha 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with QueryThe.Net's AnimatedCaptcha; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
include "GIFEncoder.class.php";
// get random numbers & operator and make sure the answer is >= 0
$k = 0 ;
while($k == 0)
{
$rand1 = rand(1, 9); // 1st number (1-9)
$rand3 = rand(1, 9); // 2nd number (1-9)
$rand2 = rand(0, 2); // operator (-,+,*)
if (($rand2 != 0) || ($rand3 < $rand1))
{
$k = 1 ;
}
}
// set sessions for numbers, operator & answer. Only $_SESSION['answer'] is necessary. Others are for displaying full equation if you desire.
$_SESSION['r1'] = $rand1 ;
$_SESSION['r3'] = $rand3 ;
if ($rand2 == 0) {$_SESSION['r2'] = " - " ; $_SESSION['answer'] = $rand1 - $rand3 ;}
elseif ($rand2 == 1) {$_SESSION['r2'] = " + " ; $_SESSION['answer'] = $rand1 + $rand3 ;}
else {$_SESSION['r2'] = " * " ; $_SESSION['answer'] = $rand1 * $rand3 ;}
// build the frame images and elapsed time to show in 2 arrays
$frames [ ] = "frames/solve.gif" ; // Intro message " Prove you are human ... "
$time [ ] = 260;
// random number & elapsed time of frames to *hopefully* make a cracker's life tougher
$i = 0;
$loop = rand(0, 20); // total number of frames in loop loop
while ($i < $loop)
{
$frames [ ] = "frames/solve.gif"; // use the solve frame so that the human eye cannot see a flicker
$time [ ] = rand(0, 5); // 5 * 20 = 1 second so the delay is never too terribly long
$i ++ ;
}
// set 1st random number
$frames [ ] = "frames/" .$rand1. ".gif"; // 1st number (0-9)
$time [ ] = 140;
// set frame for operator
if ($rand2 == 0) {$frames [ ] = "frames/minus.gif";}
elseif ($rand2 == 1) {$frames [ ] = "frames/plus.gif";}
else {$frames [ ] = "frames/times.gif";}
$time [ ] = 140;
// set 2nd random number
$frames [ ] = "frames/" .$rand3. ".gif"; // 2nd number (0-9)
$time [ ] = 140;
// set final frame for equals
$frames [ ] = "frames/equals.gif" ; // Ending message " equals = "
$time [ ] = 280; // equals frame time (100 = 1 second)
// encode the gif using the class to avoid gd dependencies
$gif = new GIFEncoder (
$frames, // frames array
$time, // elapsed time array
0, // loops (0 = infinite)
2, // disposal
0, 0, 0, // rgb of transparency
"url" // source type
);
// display the image
Header ( 'Content-type:image/gif' );
echo $gif->GetAnimation ( );
?>
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