根据分类ID获取文章列表，可主可次。
食用方法跟文章列表一样-.-

<?php
/**
 * 获取主分类旗下文章
 * @param $sortid 分类ID
 * @param $num 数量
 * @return string
 */
function whole_category($sortid,$num = 10)
{
    global $CACHE;   
    $sort_cache = $CACHE->readCache('sort');
	$Log_Model = new Log_Model();
    if ($sort_cache[$sortid]['pid'] != 0 || empty($sort_cache[$sortid]['children'])) {
        $sqlSegment = "and sortid=$sortid";
    } else {
        $sortids = array_merge(array($sortid), $sort_cache[$sortid]['children']);
        $sqlSegment = "and sortid in (" . implode(',', $sortids) . ")";
    }
    $logs = $Log_Model->getLogsForHome($sqlSegment,1, $num);
    return $logs;
}