ss5.5.5如何将验证码反序？

xyzeast · 发表于 2010-3-28 11:23:33

为了防止垃圾评论，我打算将验证码答案反序显示，即显示的验证码是1234，答案其实是4321，不懂php，想问问如何实现？

下面是ss的验证码页面：

<?php
/*
[SupeSite/X-Space] (C)2001-2006 Comsenz Inc.
验证码图片
$RCSfile: batch.seccode.php,v $
$Revision: 1.16.4.1 $
$Date: 2007/06/13 17:45:11 $
*/
$nolanguage = 1;//不包含语言包
include_once('./include/main.inc.php');
$nocacheheaders = 1;
$seccode = random(4, 1);
$seccode = sprintf('%04d', $seccode);
$supe_hash = authcode($_SGLOBAL['timestamp']."\t".$seccode, 'ENCODE');
ssetcookie('supe_hash', $supe_hash);
if($nocacheheaders) {
@header("Expires: -1");
@header("Cache-Control: no-store, private, post-check=0, pre-check=0, max-age=0", FALSE);
@header("Pragma: no-cache");
}
if(function_exists('imagecreate') && function_exists('imagecolorset') && function_exists('imagecreatefromgif') && function_exists('imagecopyresized') && function_exists('imagecolorallocate') && function_exists('imagesetpixel') && function_exists('imagechar') && function_exists('imagepng')) {
$im = imagecreate(62, 25);
$backgroundcolor = imagecolorallocate ($im, 255, 255, 255);
$numorder = array(1, 2, 3, 4);
shuffle($numorder);
$numorder = array_flip($numorder);
for($i = 1; $i <= 4; $i++) {
$imcodefile = 'images/base/number'.$seccode[$numorder[$i]].'.gif';
$x = $numorder[$i] * 13 + mt_rand(0, 4) - 2;
$y = mt_rand(0, 3);
if(file_exists($imcodefile)) {
$imcode = imagecreatefromgif($imcodefile);
$data = getimagesize($imcodefile);
imagecolorset($imcode, 0 ,mt_rand(50, 255), mt_rand(50, 128), mt_rand(50, 255));
imagecopyresized($im, $imcode, $x, $y, 0, 0, $data[0] + mt_rand(0, 6) - 3, $data[1] + mt_rand(0, 6) - 3, $data[0], $data[1]);
} else {
$text_color = imagecolorallocate($im, mt_rand(50, 255), mt_rand(50, 128), mt_rand(50, 255));
imagechar($im, 5, $x + 5, $y + 3, $seccode[$numorder[$i]], $text_color);
}
}
$linenums = mt_rand(10, 32);
for($i=0; $i <= $linenums; $i++) {
$linecolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
$linex = mt_rand(0, 62);
$liney = mt_rand(0, 25);
imageline($im, $linex, $liney, $linex + mt_rand(0, 4) - 2, $liney + mt_rand(0, 4) - 2, $linecolor);
}
for($i=0; $i <= 64; $i++) {
$pointcolor = imagecolorallocate($im, mt_rand(50, 255), mt_rand(50, 255), mt_rand(50, 255));
imagesetpixel($im, mt_rand(0, 62), mt_rand(0, 25), $pointcolor);
}
$bordercolor = imagecolorallocate($im , 150, 150, 150);
imagerectangle($im, 0, 0, 61, 24, $bordercolor);
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
} else {
$numbers = array
(
0 => array('3c','66','66','66','66','66','66','66','66','3c'),
1 => array('1c','0c','0c','0c','0c','0c','0c','0c','1c','0c'),
2 => array('7e','60','60','30','18','0c','06','06','66','3c'),
3 => array('3c','66','06','06','06','1c','06','06','66','3c'),
4 => array('1e','0c','7e','4c','2c','2c','1c','1c','0c','0c'),
5 => array('3c','66','06','06','06','7c','60','60','60','7e'),
6 => array('3c','66','66','66','66','7c','60','60','30','1c'),
7 => array('30','30','18','18','0c','0c','06','06','66','7e'),
8 => array('3c','66','66','66','66','3c','66','66','66','3c'),
9 => array('38','0c','06','06','3e','66','66','66','66','3c')
);
for($i = 0; $i < 10; $i++) {
for($j = 0; $j < 6; $j++) {
$a1 = substr('012', mt_rand(0, 2), 1).substr('012345', mt_rand(0, 5), 1);
$a2 = substr('012345', mt_rand(0, 5), 1).substr('0123', mt_rand(0, 3), 1);
mt_rand(0, 1) == 1 ? array_push($numbers[$i], $a1) : array_unshift($numbers[$i], $a1);
mt_rand(0, 1) == 0 ? array_push($numbers[$i], $a1) : array_unshift($numbers[$i], $a2);
}
}
$bitmap = array();
for($i = 0; $i < 20; $i++) {
for ($j = 0; $j < 4; $j++) {
$n = substr($seccode, $j, 1);
$bytes = $numbers[$n][$i];
$a = mt_rand(0, 14);
switch($a) {
case 1: str_replace('9', '8', $bytes); break;
case 3: str_replace('c', 'e', $bytes); break;
case 6: str_replace('3', 'b', $bytes); break;
case 8: str_replace('8', '9', $bytes); break;
case 0: str_replace('e', 'f', $bytes); break;
}
array_push($bitmap, $bytes);
}
}
for ($i = 0; $i < 8; $i++) {
$a = substr('012', mt_rand(0, 2), 1) . substr('012345', mt_rand(0, 5), 1);
array_unshift($bitmap, $a);
array_push($bitmap, $a);
}
$image = pack('H*', '424d9e000000000000003e000000280000002000000018000000010001000000'.
'0000600000000000000000000000000000000000000000000000FFFFFF00'.implode('', $bitmap));
header('Content-Type: image/bmp');
echo $image;
}
function random($length, $numeric = 0) {
mt_srand((double)microtime() * 1000000);
if($numeric) {
$hash = sprintf('%0'.$length.'d', mt_rand(0, pow(10, $length) - 1));
} else {
$hash = '';
$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz';
$max = strlen($chars) - 1;
for($i = 0; $i < $length; $i++) {
$hash .= $chars[mt_rand(0, $max)];
}
}
return $hash;
}
?>

复制代码

xyzeast · 发表于 2010-3-31 00:07:09

discuz已经没有帮忙了吗？

xyzeast · 发表于 2010-3-31 09:25:04

这个版块已经死了，4天浏览量才4个，估计都是我自己的

		自动登录	找回密码
密码			立即注册

[疑问] ss5.5.5如何将验证码反序？