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簡(jiǎn)單的說(shuō)，就是每隔一段時(shí)間（自己設(shè)定的數(shù)據(jù)緩存時(shí)間），即使沒(méi)有新帖子，這個(gè)diy模塊所調(diào)用的帖子也會(huì)變。

方式：加個(gè)選項(xiàng)，然后查詢數(shù)據(jù)的時(shí)候把這個(gè)選項(xiàng)作為一個(gè)條件，選它就按它來(lái)調(diào)用。

具體操作：

1.打開(kāi)/source/class/block/forum/block_threadhot.php，找到

array('recommends', 'threadlist_orderby_recommends'),

之下增加

array('rands', '隨機(jī)'),

2.打開(kāi)/source/class/block/forum/block_thread.php，找到

$orderby = isset($parameter['orderby']) ? (in_array($parameter['orderby'],array('lastpost','dateline','replies','views','heats','recommends')) ? $parameter['orderby'] : 'lastpost') : 'lastpost';
$lastposter = !empty($parameter['lastposter']) ? $parameter['lastposter'] : '';

改為

$orderby = isset($parameter['orderby']) ? (in_array($parameter['orderby'],array('lastpost','dateline','replies','views','heats','recommends','rands')) ? $parameter['orderby'] : 'lastpost') : 'lastpost';
$lastposter = !empty($parameter['lastposter']) ? $parameter['lastposter'] : '';

3.找到

$query = DB::query("SELECT DISTINCT t.*$sqlfield
FROM `".DB::table('forum_thread')."` t
$sqlfrom WHERE {$maxwhere}t.readperm='0'
$sql
AND t.displayorder>='0'
ORDER BY t.$orderby DESC
LIMIT $startrow,$items;"
);

改為

if($orderby=='rands'){
$query = DB::query("SELECT DISTINCT t.* $sqlfield FROM `".DB::table('forum_thread')."` t $sqlfrom WHERE {$maxwhere}t.readperm='0' $sql AND t.displayorder>='0' ORDER BY rand() LIMIT $startrow,$items;");
}else{
$query = DB::query("SELECT DISTINCT t.*$sqlfield
FROM `".DB::table('forum_thread')."` t
$sqlfrom WHERE {$maxwhere}t.readperm='0'
$sql
AND t.displayorder>='0'
ORDER BY t.$orderby DESC
LIMIT $startrow,$items;"
);
}

就是在數(shù)據(jù)查詢的外層加上了判斷，如果是隨機(jī)排序，查詢里排序條件就用ORDER BY rand()，否則按原本的排序條件。