对discuz的代码分析学习----论坛入口文件（转帖）

只是大致分析下执行流程，主要就是取得mod参数的值，根据取值加载控制器，控制器位置在最后一行指定了。

1 ）定义应用名称，加载两个必要文件

define('APPTYPEID', 2);
define('CURSCRIPT', 'forum');

require './source/class/class_core.php';//核心类
require './source/function/function_forum.php';//论坛函数库

2 ）modarray数组限定了mod取值范围

$modarray = array('ajax','announcement','attachment','forumdisplay',
    'group','image','index','medal','misc','modcp','notice','post','redirect',
    'relatekw','relatethread','rss','topicadmin','trade','viewthread','tag','collection','guide'
);
//模块缓存列表,各个子数组分别表示各个模块要缓存的缓存项
$modcachelist = array(
    'index'        => array('announcements', 'onlinelist', 'forumlinks',
            'heats', 'historyposts', 'onlinerecord', 'userstats', 'diytemplatenameforum'),
    'forumdisplay'    => array('smilies', 'announcements_forum', 'globalstick', 'forums',
            'onlinelist', 'forumstick', 'threadtable_info', 'threadtableids', 'stamps', 'diytemplatenameforum'),
    'viewthread'    => array('smilies', 'smileytypes', 'forums', 'usergroups',
            'stamps', 'bbcodes', 'smilies',    'custominfo', 'groupicon', 'stamps',
            'threadtableids', 'threadtable_info', 'posttable_info', 'diytemplatenameforum'),
    'redirect'    => array('threadtableids', 'threadtable_info', 'posttable_info'),
    'post'        => array('bbcodes_display', 'bbcodes', 'smileycodes', 'smilies', 'smileytypes',
            'domainwhitelist', 'albumcategory'),
    'space'        => array('fields_required', 'fields_optional', 'custominfo'),
    'group'        => array('grouptype', 'diytemplatenamegroup'),
);

3 ）如果mod参数为空或者不合法都会让表达式为真，导致值为index

$mod = !in_array(C::app()->var['mod'], $modarray) ? 'index' : C::app()->var['mod'];

4 ）做初始化

define('CURMODULE', $mod);
//var_dump(CURMODULE);
$cachelist = array();
if(isset($modcachelist[CURMODULE])) {//如果当前缓存项存在的话，
    $cachelist = $modcachelist[CURMODULE];//获取当前缓存组的缓存列表项

    $cachelist[] = 'plugin';
    $cachelist[] = 'pluginlanguage_system';
}
if(C::app()->var['mod'] == 'group') {
    $_G['basescript'] = 'group';
}

C::app()->cachelist = $cachelist;
C::app()->init();//初始化


loadforum();


set_rssauth();


runhooks();

5 ）加载控制器

$navtitle = str_replace('{bbname}', $_G['setting']['bbname'], $_G['setting']['seotitle']['forum']);
$_G['setting']['threadhidethreshold'] = 1;
//var_dump($mod);
require DISCUZ_ROOT.'./source/module/forum/forum_'.$mod.'.php';