discuz diy 添加随机排序功能

discuz diy 添加随机排序功能

加个选项，然后查询数据的时候把这个选项作为一个条件，选它就按它来调用。

具体操作：
1.打开/source/class/block/forum/block_threadhot.php，找到
array('recommends', 'threadlist_orderby_recommends'),
之下增加
array('rands', 'order_by_rand'),

2.打开/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'] : '';

改为
$orderby = isset($parameter['orderby']) ? (in_array($parameter['orderby'],array('lastpost','dateline','replies','views','heats','recommends','rands')) ? $parameter['orderby'] : 'lastpost') : 'lastpost';
$lastposter = !empty($parameter['lastposter']) ? $parameter['lastposter'] : '';
其实就是增加了,'rands'

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;"
);

改为
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;"
);
}
就是在数据查询的外层加上了判断，如果是随机排序，查询里排序条件就用ORDER BY rand()，否则按原本的排序条件。