Discuz的forum_index.php文件的分析
/**
* [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，不能直接訪問
if(!defined('IN_DISCUZ')) {
exit('Access Denied');
}
/**
* 返回庫文件的全路徑
*
* @param string $libname 庫文件分類及名稱
* @param string $folder 模塊目錄'module','include','class'
* @return string
*
* @example require DISCUZ_ROOT.'./source/function/function_cache.php'
* @example 我們可以利用此函數簡寫爲：require libfile('function/cache');
* 再如：require_once libfile('space/'.$do, 'include');//包含 "/source/include/space/space_profile.php" 文件
* 1、libfile函數返回庫文件的全路徑
* 2、包含文件路徑格式："/source/include/space/space_$do.php"
* 3、require_once "返回的庫文件的全路徑",這樣就可以將庫文件包含進來
*/
require_once libfile('function/forumlist');//引入"/source/function/function_forumlist.php"函數庫文件
$gid = intval(getgpc('gid'));//默認值爲0:分區id;何爲分區?簡單說,就是凌駕與版塊之上的一個分類
$showoldetails = get_index_online_details();//默認情況下爲空值，不知道怎麼回事
//論壇首頁緩存更細時間,0-不開啓
//uid-管理員id gid-分區id cacheindexlife-首頁緩存時間
//gid爲空的情況
if(!$_G['uid'] && !$gid && $_G['setting']['cacheindexlife'] && !defined('IN_ARCHIVER') && !defined('IN_MOBILE')) {
get_index_page_guest_cache();//此代碼只針對遊客
}
$newthreads = round((TIMESTAMP - $_G['member']['lastvisit'] + 600) / 1000) * 1000;
//初始化數組變量
$catlist = $forumlist = $sublist = $forumname = $collapse = $favforumlist = array();
//初始化普通變量：主題、帖子、今日帖子、短消息
$threads = $posts = $todayposts = $announcepm = 0;
//定義發帖數量
$postdata = $_G['cache']['historyposts'] ? explode("\t", $_G['cache']['historyposts']) : array(0,0);
$postdata[0] = intval($postdata[0]);//昨日發帖
$postdata[1] = intval($postdata[1]);//歷史最高發帖
//創建站點欄目名稱、描述、關鍵字
list($navtitle, $metadescription, $metakeywords) = get_seosetting('forum');
if(!$navtitle) {//$navtitle-默認值爲“論壇”
$navtitle = $_G['setting']['navs'][2]['navname'];
$nobbname = false;
} else {
//默認執行
$nobbname = true;
}
//描述
if(!$metadescription) {
$metadescription = $navtitle;
}
//關鍵字
if(!$metakeywords) {
$metakeywords = $navtitle;
}
//heatthread：熱帖
if($_G['setting']['indexhot']['status'] && $_G['cache']['heats']['expiration'] < TIMESTAMP) {
require_once libfile('function/cache');//引入"/source/function/function_cache.php"函數庫文件
updatecache('heats');
}
if($_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[$id]);
}
}
}
//默認情況下不執行,即:直接跳過這段if代碼段
if(empty($gid) && empty($_G['member']['accessmasks']) && empty($showoldetails)) {
extract(get_index_memory_by_groupid($_G['member']['groupid']));
if(defined('FORUM_INDEX_PAGE_MEMORY') && FORUM_INDEX_PAGE_MEMORY) {
categorycollapse();
if(!defined('IN_ARCHIVER')) {
include template('diy:forum/discuz');//引入模板文件的方式
} else {
include loadarchiver('forum/discuz');
}
dexit();
}
}
//默認情況下執行此if代碼段；FORUM_INDEX_PAGE_MEMORY是首頁所有緩存數據的一個常量
//gid爲空的情況 FORUM_INDEX_PAGE_MEMORY常量
if(!$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>
*/
$announcements = get_index_announcements();//首頁公告，此函數的定義在當前文件底部
//通過狀態值查詢所有開啓的版塊或分區相關信息，可查看桌面$forums = Ct('forum_forum')-fetch_all_by_status(1）.txt文件
//對應pre_forum_forum數據表中的記錄
$forums = C::t('forum_forum')->fetch_all_by_status(1);
//初始化一個數組變量
$fids = array();
foreach($forums as $forum) {//$forum-代表每一個開啓的分區或版塊相關的信息數組,一般爲一維數組
//分區或版塊id數組,格式:$fid[分區或版塊id]=分區或版塊id;$fids[1]=1
$fids[$forum['fid']] = $forum['fid'];//啓用的分區id或版塊id
}
//初始化一個版塊訪問權限數組變量
$forum_access = array();
if(!empty($_G['member']['accessmasks'])) {//用戶訪問權限標誌，默認值爲1
$forum_access = C::t('forum_access')->fetch_all_by_fid_uid($fids, $_G['uid']);
}
//獲取版塊擴展字段信息，對應數據表: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']) {//分區或版塊id
//將分區或版塊的通用信息字段或擴展字段信息合併在一起
//即將pre_forum_forum表的字段與pre_forum_fields表的字段合併在一起
$forum = array_merge($forum, $forum_fields[$forum['fid']]);//一維數組
}
if($forum_access['fid']) {
$forum = array_merge($forum, $forum_access[$forum['fid']]);
}
//版塊或分區的名稱
$forumname[$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'])) {
$forum['extra'] = array();//數組
}
//版塊的情況，不包括分區的情況
if($forum['type'] != 'group') {//版塊數組信息的情況 group-分區 forum-版塊
$threads += $forum['threads'];//主題數量
$posts += $forum['posts'];//帖子數量
$todayposts += $forum['todayposts'];//今日發帖數量
//版塊的情況
if($forum['type'] == 'forum' && isset($catlist[$forum['fup']])) {//版塊存在上級分區的情況
//forum函數的定義位置："/source/function/function_forumlist.php"函數庫文件
if(forum($forum)) {
$catlist[$forum['fup']]['forums'][] = $forum['fid'];//分區下的所有的版塊id
/*如下形式：
* [forums] => Array //當前分區下版塊id數組,即是fid數組
(
[0] => 2 //娛樂
[1] => 36 //文化
[2] => 37 //體育
[3] => 38 //藝術
[4] => 39 //商界
)
*/
//排序id
$forum['orderid'] = $catlist[$forum['fup']]['forumscount']++;
//子版塊
$forum['subforums'] = '';
$forumlist[$forum['fid']] = $forum;//僅版塊數組 $forumlist,可查看桌面$forumlist.txt文件
}
} elseif(isset($forumlist[$forum['fup']])) {//$forum['fup']=64 的情況，即：女裝版塊
//女裝版塊下的子版塊數組信息
$forumlist[$forum['fup']]['threads'] += $forum['threads'];//主題數量
$forumlist[$forum['fup']]['posts'] += $forum['posts'];//帖子數量
$forumlist[$forum['fup']]['todayposts'] += $forum['todayposts'];//今日發帖數
if($_G['setting']['subforumsindex'] && $forumlist[$forum['fup']]['permission'] == 2 && !($forumlist[$forum['fup']]['simple'] & 16) || ($forumlist[$forum['fup']]['simple'] & 8)) {
//綁定的域名
$forumurl = !empty($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 {//分區的情況,不包含版塊的情況
if($forum['moderators']) {//版主
$forum['moderators'] = moddisplay($forum['moderators'], 'flat');
}
$forum['forumscount'] = 0;
$catlist[$forum['fid']] = $forum;//分區數組信息
}
}
//銷燬不用的數組變量
unset($forum_access, $forum_fields);
//循環分區二維數組信息 分區id 一維數組分區信息
foreach($catlist as $catid => $category) {
$catlist[$catid]['collapseimg'] = 'collapsed_no.gif';//伸張或收縮圖片
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", $_G['cache']['onlinerecord']);//在線訪問記錄.Array ( [0] => 2 [1] => 1378968576 )
if(empty($_G['cookie']['onlineusernum'])) {//在線用戶數
$onlinenum = C::app()->session->count();
if($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,//分區數組列表,不包含版塊,此數組對應版塊擴展表及版塊表-pre_forum_forumfield、pre_forum_forum的字段
'forumlist' => $forumlist,//無下級版塊的版塊信息數組
'sublist' => $sublist,//子版塊列表
'whosonline' => $whosonline,//誰在線
'onlinenum' => $onlinenum,//在線人數
'membercount' => $membercount,//會員數
'guestcount' => $guestcount,//遊客數
'announcements' => $announcements,//公告
'threads' => $threads,//主題數
'posts' => $posts,//帖子數
'todayposts' => $todayposts,//今天發表帖子數
'onlineinfo' => $onlineinfo,//在線信息
'announcepm' => $announcepm), getglobal('setting/memory/forumindex'));
}
} else {
require_once DISCUZ_ROOT.'./source/include/misc/misc_category.php';
}
if(defined('IN_ARCHIVER')) {
include loadarchiver('forum/discuz');
exit();
}
//版塊伸張或收縮
categorycollapse();
/*
* 1、gid-分區id不爲空的情況，如果gid爲空時，不會執行下面if...else...中的代碼段
* 2、$catlist：查看桌面
echo "<pre>";
print_r($catlist);
exit;
* 3、$_G['category']全局變量的生成
* 4、$_G['fid']全局變量的生成
*/
//gid不爲空的情況
if($gid && !empty($catlist)) {//當前分區版塊
$_G['category'] = $catlist[$gid];//gid-分區id 當前分區數組數據，包括所有的子版塊fid
$forumseoset = array(//當前分區的SEO設置
'seotitle' => $catlist[$gid]['seotitle'],//分區SEO標題
'seokeywords' => $catlist[$gid]['keywords'],//分區SEO關鍵字
'seodescription' => $catlist[$gid]['seodescription']//分區SEO描述
);
$seodata = array('fgroup' => $catlist[$gid]['name']);//當前分區名稱
//生成當前分區的SEO信息
list($navtitle, $metadescription, $metakeywords) = get_seosetting('threadlist', $seodata, $forumseoset);
if(empty($navtitle)) {
$navtitle = $navtitle_g;
$nobbname = false;
} else {//默認執行
$nobbname = true;
}
$_G['fid'] = $gid;//當前分區id
}
/*
* 1、對應模板文件：/data/diy/forum/discuz.htm 或者 /template/default/forum/discuz.htm,兩者選其一
* 2、使用template()函數顯示已經存在的模板
* 3、格式 include template("模板文件夾/模板名稱無後綴");的方式進行解析
* 4、在 source/function/function_core.php文件中定義
* 5、如：include template('forum/mytest'); //使用自定義模板套系中的forum目錄的mytest.htm
*/
include template('diy:forum/discuz:'.$gid);//結果:template("diy:forum/discuz:0")
/*
* 1、獲取首頁公告
*/
function get_index_announcements() {
global $_G;//超級全局變量
$announcements = '';//公告變量
if($_G['cache']['announcements']) {//公告數組
$readapmids = !empty($_G['cookie']['readapmid']) ? explode('D', $_G['cookie']['readapmid']) : array();
foreach($_G['cache']['announcements'] as $announcement) {
//公告結束時間不爲空，公告結束時間大於當前時間
if(!$announcement['endtime'] || $announcement['endtime'] > TIMESTAMP && (empty($announcement['groups']) || in_array($_G['member']['groupid'], $announcement['groups']))) {
if(empty($announcement['type'])) {//公告類型爲空的情況
$announcements .= '<li><span><a href="forum.php?mod=announcement&id='.$announcement['id'].'" target="_blank" class="xi2">'.$announcement['subject'].
'</a></span><em>('.dgmdate($announcement['starttime'], 'd').')</em></li>';
} elseif($announcement['type'] == 1) {//公告類型爲1的情況
$announcements .= '<li><span><a href="'.$announcement['message'].'" target="_blank" class="xi2">'.$announcement['subject'].
'</a></span><em>('.dgmdate($announcement['starttime'], 'd').')</em></li>';
}
}
}
}
return $announcements;
}
/*
* 1、獲取遊客數據緩存
*/
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 $gzip .';
}
</script>";
exit();
}
}
/*
* 1、獲取論壇首頁緩存
*/
function get_index_memory_by_groupid($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、獲取首頁在線信息詳情
*/
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、版塊綁定的域名
*/
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);
}
}
}
//版塊伸張或收縮功能函數
function categorycollapse() {
global $_G, $collapse, $catlist;
if(!$_G['uid']) {
return;
}
//此時 fid-分區id forum-可以查看桌面
//如果是首頁,那麼就會有多個分區
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';//伸展或收縮圖片
$collapse['category_'.$fid] = 'display: none';//跟html標籤的id屬性值有關
}
}
if(!isset($_G['cookie']['collapse']) || strpos($_G['cookie']['collapse'], '_category_0_') === FALSE) {
$collapse['collapseimg_0'] = 'collapsed_no.gif';//伸展或收縮圖片
$collapse['category_0'] = '';
} else {
$collapse['collapseimg_0'] = 'collapsed_yes.gif';//伸展或收縮圖片
$collapse['category_0'] = 'display: none';
}
}
?>
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