【discuzx2】forum_index.php文件的分析

<?php/***      [Discuz!] (C)2001-2099 Comsenz Inc.*      This is NOT a freeware, use is subject to license terms**      $Id: forum_index.php 29580 2012-04-20 02:53:59Z svn_project_zhangjie $*///mod文件只能被入口文件引用，不能直接访问
if(!defined('IN_DISCUZ')) {exit('Access Denied');
}/**
* 返回库文件的全路径
*
* @param string $libname 库文件分类及名称
* @param string $folder 模块目录'module','include','class'
* @return string
*
* @example require DISCUZ_ROOT.'./source/function/function_cache.php'
* @example 我们可以利用此函数简写为：require libfile('function/cache');
* 再如：require_once libfile('space/'.$do, 'include');//包含 "/source/include/space/space_profile.php" 文件
* 1、libfile函数返回库文件的全路径
* 2、包含文件路径格式："/source/include/space/space_$do.php"
* 3、require_once "返回的库文件的全路径",这样就可以将库文件包含进来
*/
require_once libfile('function/forumlist');//引入"/source/function/function_forumlist.php"函数库文件$gid = intval(getgpc('gid'));//默认值为0:分区id;何为分区?简单说,就是凌驾与版块之上的一个分类
$showoldetails = get_index_online_details();//默认情况下为空值，不知道怎么回事//论坛首页缓存更细时间,0-不开启
//uid-管理员id   gid-分区id   cacheindexlife-首页缓存时间
//gid为空的情况
if(!$_G['uid'] && !$gid && $_G['setting']['cacheindexlife'] && !defined('IN_ARCHIVER') && !defined('IN_MOBILE')) {get_index_page_guest_cache();//此代码只针对游客
}$newthreads = round((TIMESTAMP - $_G['member']['lastvisit'] + 600) / 1000) * 1000;
//初始化数组变量
$catlist = $forumlist = $sublist = $forumname = $collapse = $favforumlist = array();
//初始化普通变量：主题、帖子、今日帖子、短消息
$threads = $posts = $todayposts = $announcepm = 0;
//定义发帖数量
$postdata = $_G['cache']['historyposts'] ? explode("\t", $_G['cache']['historyposts']) : array(0,0);
$postdata[0] = intval($postdata[0]);//昨日发帖
$postdata[1] = intval($postdata[1]);//历史最高发帖//创建站点栏目名称、描述、关键字
list($navtitle, $metadescription, $metakeywords) = get_seosetting('forum');
if(!$navtitle) {//$navtitle-默认值为“论坛”$navtitle = $_G['setting']['navs'][2]['navname'];$nobbname = false;
} else {//默认执行$nobbname = true;
}
//描述
if(!$metadescription) {$metadescription = $navtitle;
}
//关键字
if(!$metakeywords) {$metakeywords = $navtitle;
}//heatthread：热帖
if($_G['setting']['indexhot']['status'] && $_G['cache']['heats']['expiration'] < TIMESTAMP) {require_once libfile('function/cache');//引入"/source/function/function_cache.php"函数库文件updatecache('heats');
}if($_G['uid'] && empty($_G['cookie']['nofavfid'])) {$favfids = array();$forum_favlist = C::t('home_favorite')->fetch_all_by_uid_idtype($_G['uid'], 'fid');if(!$forum_favlist) {dsetcookie('nofavfid', 1, 31536000);}foreach($forum_favlist as $key => $favorite) {if(defined('IN_MOBILE')) {$forum_favlist[$key]['title'] = strip_tags($favorite['title']);}$favfids[] = $favorite['id'];}if($favfids) {$favforumlist = C::t('forum_forum')->fetch_all($favfids);foreach($favforumlist as $id => $forum) {forum($favforumlist[$id]);}}
}//默认情况下不执行,即:直接跳过这段if代码段
if(empty($gid) && empty($_G['member']['accessmasks']) && empty($showoldetails)) {extract(get_index_memory_by_groupid($_G['member']['groupid']));if(defined('FORUM_INDEX_PAGE_MEMORY') && FORUM_INDEX_PAGE_MEMORY) {categorycollapse();if(!defined('IN_ARCHIVER')) {include template('diy:forum/discuz');//引入模板文件的方式} else {include loadarchiver('forum/discuz');}dexit();}
}//默认情况下执行此if代码段；FORUM_INDEX_PAGE_MEMORY是首页所有缓存数据的一个常量
//gid为空的情况             FORUM_INDEX_PAGE_MEMORY常量
if(!$gid && (!defined('FORUM_INDEX_PAGE_MEMORY') || !FORUM_INDEX_PAGE_MEMORY)) {/*格式：* <li><span><a href="">公告1</a></span></li>* <li><span><a href="">公告2</a></span></li>*/$announcements = get_index_announcements();//首页公告，此函数的定义在当前文件底部//通过状态值查询所有开启的版块或分区相关信息，可查看桌面$forums = Ct('forum_forum')-fetch_all_by_status(1）.txt文件//对应pre_forum_forum数据表中的记录$forums = C::t('forum_forum')->fetch_all_by_status(1);//初始化一个数组变量$fids = array();foreach($forums as $forum) {//$forum-代表每一个开启的分区或版块相关的信息数组,一般为一维数组//分区或版块id数组,格式:$fid[分区或版块id]=分区或版块id;$fids[1]=1$fids[$forum['fid']] = $forum['fid'];//启用的分区id或版块id}//初始化一个版块访问权限数组变量$forum_access = array();if(!empty($_G['member']['accessmasks'])) {//用户访问权限标志，默认值为1$forum_access = C::t('forum_access')->fetch_all_by_fid_uid($fids, $_G['uid']);}//获取版块扩展字段信息，对应数据表:pre_forum_forumfield,查看桌面 $forum_fields.txt文件$forum_fields = C::t('forum_forumfield')->fetch_all($fids);foreach($forums as $forum) {if($forum_fields[$forum['fid']]['fid']) {//分区或版块id//将分区或版块的通用信息字段或扩展字段信息合并在一起//即将pre_forum_forum表的字段与pre_forum_fields表的字段合并在一起$forum = array_merge($forum, $forum_fields[$forum['fid']]);//一维数组}if($forum_access['fid']) {$forum = array_merge($forum, $forum_access[$forum['fid']]);}//版块或分区的名称$forumname[$forum['fid']] = strip_tags($forum['name']);//反序列化的pre_forum_forumfields表中extra字段的值$forum['extra'] = empty($forum['extra']) ? array() : dunserialize($forum['extra']);if(!is_array($forum['extra'])) {$forum['extra'] = array();//数组}//版块的情况，不包括分区的情况if($forum['type'] != 'group') {//版块数组信息的情况   group-分区  forum-版块$threads += $forum['threads'];//主题数量$posts += $forum['posts'];//帖子数量$todayposts += $forum['todayposts'];//今日发帖数量//版块的情况if($forum['type'] == 'forum' && isset($catlist[$forum['fup']])) {//版块存在上级分区的情况//forum函数的定义位置："/source/function/function_forumlist.php"函数库文件if(forum($forum)) {$catlist[$forum['fup']]['forums'][] = $forum['fid'];//分区下的所有的版块id/*如下形式：* [forums] => Array         //当前分区下版块id数组,即是fid数组([0] => 2         //娱乐[1] => 36        //文化[2] => 37        //体育[3] => 38        //艺术[4] => 39        //商界)*///排序id$forum['orderid'] = $catlist[$forum['fup']]['forumscount']++;//子版块$forum['subforums'] = '';$forumlist[$forum['fid']] = $forum;//仅版块数组 $forumlist,可查看桌面$forumlist.txt文件}} elseif(isset($forumlist[$forum['fup']])) {//$forum['fup']=64 的情况，即：女装版块//女装版块下的子版块数组信息$forumlist[$forum['fup']]['threads'] += $forum['threads'];//主题数量$forumlist[$forum['fup']]['posts'] += $forum['posts'];//帖子数量$forumlist[$forum['fup']]['todayposts'] += $forum['todayposts'];//今日发帖数if($_G['setting']['subforumsindex'] && $forumlist[$forum['fup']]['permission'] == 2 && !($forumlist[$forum['fup']]['simple'] & 16) || ($forumlist[$forum['fup']]['simple'] & 8)) {//绑定的域名$forumurl = !empty($forum['domain']) && !empty($_G['setting']['domain']['root']['forum']) ? 'http://'.$forum['domain'].'.'.$_G['setting']['domain']['root']['forum'] : 'forum.php?mod=forumdisplay&fid='.$forum['fid'];$forumlist[$forum['fup']]['subforums'] .= (empty($forumlist[$forum['fup']]['subforums']) ? '' : ', ').'<a href="'.$forumurl.'" '.(!empty($forum['extra']['namecolor']) ? ' style="color: ' . $forum['extra']['namecolor'].';"' : '') . '>'.$forum['name'].'</a>';}}} else {//分区的情况,不包含版块的情况if($forum['moderators']) {//版主$forum['moderators'] = moddisplay($forum['moderators'], 'flat');}$forum['forumscount']  = 0;$catlist[$forum['fid']] = $forum;//分区数组信息}}//销毁不用的数组变量unset($forum_access, $forum_fields);//循环分区二维数组信息   分区id  一维数组分区信息foreach($catlist as $catid => $category) {$catlist[$catid]['collapseimg'] = 'collapsed_no.gif';//伸张或收缩图片if($catlist[$catid]['forumscount'] && $category['forumcolumns']) {$catlist[$catid]['forumcolwidth'] = (floor(100 / $category['forumcolumns']) - 0.1).'%';$catlist[$catid]['endrows'] = '';if($colspan = $category['forumscount'] % $category['forumcolumns']) {while(($category['forumcolumns'] - $colspan) > 0) {$catlist[$catid]['endrows'] .= '<td width="'.$catlist[$catid]['forumcolwidth'].'"> </td>';$colspan ++;}$catlist[$catid]['endrows'] .= '</tr>';}} elseif(empty($category['forumscount'])) {unset($catlist[$catid]);}}unset($catid, $category);if(isset($catlist[0]) && $catlist[0]['forumscount']) {$catlist[0]['fid'] = 0;$catlist[0]['type'] = 'group';$catlist[0]['name'] = $_G['setting']['bbname'];$catlist[0]['collapseimg'] = 'collapsed_no.gif';} else {unset($catlist[0]);}if(!IS_ROBOT && ($_G['setting']['whosonlinestatus'] == 1 || $_G['setting']['whosonlinestatus'] == 3)) {$_G['setting']['whosonlinestatus'] = 1;$onlineinfo = explode("\t", $_G['cache']['onlinerecord']);//在线访问记录.Array ( [0] => 2 [1] => 1378968576 )if(empty($_G['cookie']['onlineusernum'])) {//在线用户数$onlinenum = C::app()->session->count();if($onlinenum > $onlineinfo[0]) {$onlinerecord = "$onlinenum\t".TIMESTAMP;C::t('common_setting')->update('onlinerecord', $onlinerecord);savecache('onlinerecord', $onlinerecord);$onlineinfo = array($onlinenum, TIMESTAMP);}dsetcookie('onlineusernum', intval($onlinenum), 300);} else {$onlinenum = intval($_G['cookie']['onlineusernum']);}$onlineinfo[1] = dgmdate($onlineinfo[1], 'd');$detailstatus = $showoldetails == 'yes' || (((!isset($_G['cookie']['onlineindex']) && !$_G['setting']['whosonline_contract']) || $_G['cookie']['onlineindex']) && $onlinenum < 500 && !$showoldetails);$guestcount = $membercount = 0;if(!empty($_G['setting']['sessionclose'])) {$detailstatus = false;$membercount = C::app()->session->count(1);$guestcount = $onlinenum - $membercount;}if($detailstatus) {$actioncode = lang('action');$_G['uid'] && updatesession();$whosonline = array();$_G['setting']['maxonlinelist'] = $_G['setting']['maxonlinelist'] ? $_G['setting']['maxonlinelist'] : 500;foreach(C::app()->session->fetch_member(1, 0, $_G['setting']['maxonlinelist']) as $online){$membercount ++;if($online['invisible']) {$invisiblecount++;continue;} else {$online['icon'] = !empty($_G['cache']['onlinelist'][$online['groupid']]) ? $_G['cache']['onlinelist'][$online['groupid']] : $_G['cache']['onlinelist'][0];}$online['lastactivity'] = dgmdate($online['lastactivity'], 't');$whosonline[] = $online;}if(isset($_G['cache']['onlinelist'][7]) && $_G['setting']['maxonlinelist'] > $membercount) {foreach(C::app()->session->fetch_member(2, 0, $_G['setting']['maxonlinelist'] - $membercount) as $online){$online['icon'] = $_G['cache']['onlinelist'][7];$online['username'] = $_G['cache']['onlinelist']['guest'];$online['lastactivity'] = dgmdate($online['lastactivity'], 't');$whosonline[] = $online;}}unset($actioncode, $online);if($onlinenum > $_G['setting']['maxonlinelist']) {$membercount = C::app()->session->count(1);$invisiblecount = C::app()->session->count_invisible();}if($onlinenum < $membercount) {$onlinenum = C::app()->session->count();dsetcookie('onlineusernum', intval($onlinenum), 300);}$invisiblecount = intval($invisiblecount);$guestcount = $onlinenum - $membercount;unset($online);}} else {$_G['setting']['whosonlinestatus'] = 0;}if(defined('FORUM_INDEX_PAGE_MEMORY') && !FORUM_INDEX_PAGE_MEMORY) {$key = !IS_ROBOT ? $_G['member']['groupid'] : 'for_robot';memory('set', 'forum_index_page_'.$key, array('catlist' => $catlist,//分区数组列表,不包含版块,此数组对应版块扩展表及版块表-pre_forum_forumfield、pre_forum_forum的字段'forumlist' => $forumlist,//无下级版块的版块信息数组'sublist' => $sublist,//子版块列表'whosonline' => $whosonline,//谁在线'onlinenum' => $onlinenum,//在线人数'membercount' => $membercount,//会员数'guestcount' => $guestcount,//游客数'announcements' => $announcements,//公告'threads' => $threads,//主题数'posts' => $posts,//帖子数'todayposts' => $todayposts,//今天发表帖子数'onlineinfo' => $onlineinfo,//在线信息'announcepm' => $announcepm), getglobal('setting/memory/forumindex'));}} else {require_once DISCUZ_ROOT.'./source/include/misc/misc_category.php';
}if(defined('IN_ARCHIVER')) {include loadarchiver('forum/discuz');exit();
}//版块伸张或收缩
categorycollapse();/** 1、gid-分区id不为空的情况，如果gid为空时，不会执行下面if...else...中的代码段* 2、$catlist：查看桌面echo "<pre>";print_r($catlist);exit;* 3、$_G['category']全局变量的生成* 4、$_G['fid']全局变量的生成*/
//gid不为空的情况
if($gid && !empty($catlist)) {//当前分区版块$_G['category'] = $catlist[$gid];//gid-分区id        当前分区数组数据，包括所有的子版块fid$forumseoset = array(//当前分区的SEO设置'seotitle' => $catlist[$gid]['seotitle'],//分区SEO标题'seokeywords' => $catlist[$gid]['keywords'],//分区SEO关键字'seodescription' => $catlist[$gid]['seodescription']//分区SEO描述);$seodata = array('fgroup' => $catlist[$gid]['name']);//当前分区名称//生成当前分区的SEO信息list($navtitle, $metadescription, $metakeywords) = get_seosetting('threadlist', $seodata, $forumseoset);if(empty($navtitle)) {$navtitle = $navtitle_g;$nobbname = false;} else {//默认执行$nobbname = true;}$_G['fid'] = $gid;//当前分区id
}/** 1、对应模板文件：/data/diy/forum/discuz.htm  或者 /template/default/forum/discuz.htm,两者选其一* 2、使用template()函数显示已经存在的模板* 3、格式 include template("模板文件夹/模板名称无后缀");的方式进行解析* 4、在 source/function/function_core.php文件中定义* 5、如：include template('forum/mytest'); //使用自定义模板套系中的forum目录的mytest.htm*/
include template('diy:forum/discuz:'.$gid);//结果:template("diy:forum/discuz:0")/** 1、获取首页公告*/
function get_index_announcements() {global $_G;//超级全局变量$announcements = '';//公告变量if($_G['cache']['announcements']) {//公告数组$readapmids = !empty($_G['cookie']['readapmid']) ? explode('D', $_G['cookie']['readapmid']) : array();foreach($_G['cache']['announcements'] as $announcement) {//公告结束时间不为空，公告结束时间大于当前时间if(!$announcement['endtime'] || $announcement['endtime'] > TIMESTAMP && (empty($announcement['groups']) || in_array($_G['member']['groupid'], $announcement['groups']))) {if(empty($announcement['type'])) {//公告类型为空的情况$announcements .= '<li><span><a href="forum.php?mod=announcement&id='.$announcement['id'].'" target="_blank" class="xi2">'.$announcement['subject'].'</a></span><em>('.dgmdate($announcement['starttime'], 'd').')</em></li>';} elseif($announcement['type'] == 1) {//公告类型为1的情况$announcements .= '<li><span><a href="'.$announcement['message'].'" target="_blank" class="xi2">'.$announcement['subject'].'</a></span><em>('.dgmdate($announcement['starttime'], 'd').')</em></li>';}}}}return $announcements;
}/** 1、获取游客数据缓存*/
function get_index_page_guest_cache() {global $_G;$indexcache = getcacheinfo(0);if(TIMESTAMP - $indexcache['filemtime'] > $_G['setting']['cacheindexlife']) {@unlink($indexcache['filename']);define('CACHE_FILE', $indexcache['filename']);} elseif($indexcache['filename']) {@readfile($indexcache['filename']);$updatetime = dgmdate($indexcache['filemtime'], 'H:i:s');$gzip = $_G['gzipcompress'] ? ', Gzip enabled' : '';echo "<script type=\"text/javascript\">if($('debuginfo')) {$('debuginfo').innerHTML = '. This page is cached  at $updatetime $gzip .';}</script>";exit();}
}/** 1、获取论坛首页缓存*/
function get_index_memory_by_groupid($key) {$enable = getglobal('setting/memory/forumindex');if($enable !== null && memory('check')) {if(IS_ROBOT) {$key = 'for_robot';}$ret = memory('get', 'forum_index_page_'.$key);define('FORUM_INDEX_PAGE_MEMORY', $ret ? 1 : 0);if($ret) {return $ret;}}return array('none' => null);
}/** 1、获取首页在线信息详情*/
function get_index_online_details() {$showoldetails = getgpc('showoldetails');switch($showoldetails) {case 'no': dsetcookie('onlineindex', ''); break;case 'yes': dsetcookie('onlineindex', 1, 86400 * 365); break;}return $showoldetails;
}/** 1、版块绑定的域名*/
function do_forum_bind_domains() {global $_G;if($_G['setting']['binddomains'] && $_G['setting']['forumdomains']) {$loadforum = isset($_G['setting']['binddomains'][$_SERVER['HTTP_HOST']]) ? max(0, intval($_G['setting']['binddomains'][$_SERVER['HTTP_HOST']])) : 0;if($loadforum) {dheader('Location: '.$_G['setting']['siteurl'].'/forum.php?mod=forumdisplay&fid='.$loadforum);}}
}//版块伸张或收缩功能函数
function categorycollapse() {global $_G, $collapse, $catlist;if(!$_G['uid']) {return;}//此时 fid-分区id   forum-可以查看桌面//如果是首页,那么就会有多个分区foreach($catlist as $fid => $forum) {if(!isset($_G['cookie']['collapse']) || strpos($_G['cookie']['collapse'], '_category_'.$fid.'_') === FALSE) {$catlist[$fid]['collapseimg'] = 'collapsed_no.gif';$collapse['category_'.$fid] = '';} else {$catlist[$fid]['collapseimg'] = 'collapsed_yes.gif';//伸展或收缩图片$collapse['category_'.$fid] = 'display: none';//跟html标签的id属性值有关}}if(!isset($_G['cookie']['collapse']) || strpos($_G['cookie']['collapse'], '_category_0_') === FALSE) {$collapse['collapseimg_0'] = 'collapsed_no.gif';//伸展或收缩图片$collapse['category_0'] = '';} else {$collapse['collapseimg_0'] = 'collapsed_yes.gif';//伸展或收缩图片$collapse['category_0'] = 'display: none';}
}
?>

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