x2的回帖奖励功能分析
进入source\include\post\post_newreply.php文件，在438行附近找到如下代码：
if($thread['replycredit'] > 0 && $thread['authorid'] != $_G['uid'] && $_G['uid']) {
如果$thread['replycredit']大于0，同时帖子作者不是当前登录用户，则进入下面的处理流程。
$thread['replycredit']为当前帖子的回帖奖励总积分。
$replycredit_rule = DB::fetch_first("SELECT * FROM ".DB::table('forum_replycredit')." WHERE tid = '$_G[tid]' LIMIT 1");
$have_replycredit = DB::result_first("SELECT COUNT(*) FROM ".DB::table('common_credit_log')." WHERE relatedid = '{$_G[tid]}' AND uid = '{$_G[uid]}' AND operation = 'RCA' LIMIT {$replycredit_rule['times']} ");$replycredit_rule为从forum_replycredit表中查询该帖的回帖奖励设置数组，具体格式为
array(
'tid' => '帖子tid',
'extcredits' => '每次回帖的奖励积分',
'times' => '奖励次数',
'membertimes' => '每个人最多奖励的次数',
'random' => '中奖率',
'extcreditstype' => '奖励的积分类型',
)$have_replycredit为从common_credit_log表中查询该帖中当前登录用户的已奖励次数。
if($replycredit_rule['membertimes'] - $have_replycredit > 0 && $thread['replycredit'] - $replycredit_rule['extcredits'] >= 0) {如果该帖的每个人最多奖励次数$replycredit_rule['membertimes']大于该帖中当前登录用户的已奖励次数$have_replycredit，同时该帖的回帖奖励总积分$thread['replycredit']大于或等于该帖每次回帖的奖励积分$replycredit_rule['extcredits']。
$replycredit_rule['extcreditstype'] = $replycredit_rule['extcreditstype'] ? $replycredit_rule['extcreditstype'] : $_G['setting']['creditstransextra'][10];
$replycredit_rule['extcreditstype']为该帖奖励积分的积分类型，如果存在$replycredit_rule['extcreditstype']的话就为$replycredit_rule['extcreditstype']，否则为$_G['setting']['creditstransextra'][10]。
$_G['setting']['creditstransextra'][10]为后台->全局->积分设置下设置的回帖奖励使用的积分。
if($replycredit_rule['random'] > 0) {
$rand = rand(1, 100);
$rand_replycredit = $rand <= $replycredit_rule['random'] ? true : false ;
} else {
$rand_replycredit = true;
}如果该帖回帖奖励的中奖率$replycredit_rule['random']大于0：
$rand为在1-100中间生成的一个随机数，如果$rand小于或等于$replycredit_rule['random']，则设置$rand_replycredit为true，否则为false。
如果该帖回帖奖励的中奖率$replycredit_rule['random']不大于0：
设置$rand_replycredit为true。
if($rand_replycredit) {
if(!$posttable) {
$posttable = getposttablebytid($_G['tid']);
}
updatemembercount($_G['uid'], array($replycredit_rule['extcreditstype'] => $replycredit_rule['extcredits']), 1, 'RCA', $_G[tid]);
DB::update($posttable, array('replycredit' => $replycredit_rule['extcredits']), array('pid' => $pid));
DB::update("forum_thread", array('replycredit' => $thread['replycredit'] - $replycredit_rule['extcredits']), array('tid' => $_G[tid]));
}如果存在$rand_replycredit：
if(!$posttable) {
$posttable = getposttablebytid($_G['tid']);
}如果不存在回帖表$posttable，则通过tid获取$posttable。
updatemembercount($_G['uid'], array($replycredit_rule['extcreditstype'] => $replycredit_rule['extcredits']), 1, 'RCA', $_G[tid]);
根据回帖奖励的规则，更新当前登录用户的积分：在原有积分基础上+$replycredit_rule['extcredits']。$replycredit_rule['extcreditstype']为积分类型，$replycredit_rule['extcredits']为奖励积分数。
DB::update($posttable, array('replycredit' => $replycredit_rule['extcredits']), array('pid' => $pid));更新回帖表$posttable中当前用户回复的积分奖励。
DB::update("forum_thread", array('replycredit' => $thread['replycredit'] - $replycredit_rule['extcredits']), array('tid' => $_G[tid]));$thread['replycredit'] - $replycredit_rule['extcredits']为计算回帖奖励的剩余总积分。
更新主题表forum_thread中当前帖子的回帖奖励总积分replycredit。