Discuz 自动同步登陆的完美解决办法

<?php
// 此处需要修改为Discuz根目录下config.php中的对应设置
$cookiepre = 'dz_'; // cookie 前缀
$cookiedomain = ''; // cookie 作用域
$cookiepath = '/'; // cookie 作用路径
$timestamp = time();
function _setcookie($var, $value, $life = 0, $prefix = 1) {
global $cookiepre, $cookiedomain, $cookiepath, $timestamp, $_SERVER;
setcookie(($prefix ? $cookiepre : '').$var, $value,
$life ? $timestamp + $life : 0, $cookiepath,
$cookiedomain, $_SERVER['SERVER_PORT'] == 443 ? 1 : 0);
}
function _authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {
$ckey_length = 4;
$key = md5($key ? $key : UC_KEY);
$keya = md5(substr($key, 0, 16));
$keyb = md5(substr($key, 16, 16));
$keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';
$cryptkey = $keya.md5($keya.$keyc);
$key_length = strlen($cryptkey);
$string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string;
$string_length = strlen($string);
$result = '';
$box = range(0, 255);
$rndkey = array();
for($i = 0; $i <= 255; $i++) {
$rndkey[$i] = ord($cryptkey[$i % $key_length]);
}
for($j = $i = 0; $i < 256; $i++) {
$j = ($j + $box[$i] + $rndkey[$i]) % 256;
$tmp = $box[$i];
$box[$i] = $box[$j];
$box[$j] = $tmp;
}
for($a = $j = $i = 0; $i < $string_length; $i++) {
$a = ($a + 1) % 256;
$j = ($j + $box[$a]) % 256;
$tmp = $box[$a];
$box[$a] = $box[$j];
$box[$j] = $tmp;
$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
}
if($operation == 'DECODE') {
if((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {
return substr($result, 26);
} else {
return '';
}
} else {
return $keyc.str_replace('=', '', base64_encode($result));
}
}
function _synlogin($uid){
global $dz_tablepre;
//此处需要修改一下文件的相对路径
require_once dirname(__FILE__).'/../forum/forumdata/cache/cache_settings.php';
$uid = intval($uid);
$cookietime = 2592000;
$discuz_auth_key = md5($_DCACHE['settings']['authkey'].$_SERVER['HTTP_USER_AGENT']);
$member = get_row_array_from_sql("SELECT username, uid, password, secques FROM ".$dz_tablepre."members WHERE uid='$uid'");
_setcookie('sid', '', -86400 * 365);
_setcookie('cookietime', $cookietime, 31536000);
_setcookie('auth', _authcode("$member[password]\t$member[secques]\t$member[uid]", 'ENCODE', $discuz_auth_key), $cookietime);
}
function _synlogout() {
_setcookie('auth', '', -86400 * 365);
_setcookie('sid', '', -86400 * 365);
_setcookie('loginuser', '', -86400 * 365);
_setcookie('activationauth', '', -86400 * 365);
}

if ($discuz_uid){
session_start();
$_SESSION["uid"] = $discuz_uid;
}