$user = array(); 
                $on = $passstr = $ons = null; 
                if($post['first']==1 && strpos($post['message'],'[pass=')!==false && $on === null){ 
                        preg_match('/\[pass=(.*)\](.*)\[\/pass\]/isU',$post['message'],$passstr); 
                        preg_match('/\[user\](.*)\[\/user\]/isU',$post['message'],$user); 
                        unset($user[0]); 
                        if(isset($user[1])){ 
                                $user = explode(',',$user[1]); 
                        }else { 
                                $user = array(); 
                        } 
                        count($passstr)!==3 && $ons = 1; 
                        //让游客永远为假. 
                        isset($discuz_uid)===false && $ons = 3; 
                        if($ons === null && in_array($discuz_uid,$user)===false && isset($passs)){ 
                                $passs === $passstr[2] && $ons = 2; 
                                if($ons === 2){ 
                                        $user[] =$discuz_uid; 
                                        $user = implode(',',$user); 
                                        $post['message'] = strtr($post['message'],array('[/pass]'=>"[/pass][user]{$user}[/user]")); 
                                        $db->query("UPDATE `{$tablepre}posts` SET `message` = '{$post['message']}' WHERE `pid` = '{$post['pid']}'"); 
                                }else { 
                                        showmessage('你的密码错误,请重新输入',dreferer()); 
                                } 
                        }elseif (in_array($discuz_uid,$user)===false || $ons === 3) { 
                        $post['htmlon'] = 1; 
                        $post['message'] = '<br /><br /><br /> 
                        <form action="viewthread.php?tid='.$tid.'" enctype="application/x-www-form-urlencoded" method="post"> 
                        <ul style="border:1px solid #FC3; background-color:#F3F9E6;padding:8px;"> 
                        <li style="list-style:none; color:red">信息： '.$passstr[1].'</li> 
                        <li style="list-style:none;"><input name="passs" type="text" value="请输入密码" onclick="this.value=\'\';this.onclick=\'\'" /><input type="submit" value="确认密码" /></li> 
                        <li style="list-style:none;color:#06F; font-size:12px;">提示: 只有输入用户所设置的密码,才可查看用户的主题内容</li> 
                        </ul></form>'; 
                        } 
                        //最后将部分内容清除: 
                        $post['message'] = preg_replace(array('/\[pass=.*\].*\[\/pass\]/isU','/\[user\].*\[\/user\]/isU'),'',$post['message']); 
                }