get_maincat官方定义，供大家参考
function get_maincat($catid, $moduleid, $level = -1) {global $db;
$condition = $catid ? "parentid=$catid" : "moduleid=$moduleid AND parentid=0";
if($level >= 0) $condition .= " AND level=$level";
$cat = array();
$result = $db->query("SELECT catid,catname,child,style,linkurl,item FROM {$db->pre}category WHERE $condition ORDER BY listorder,catid ASC", 'CACHE');
while($r = $db->fetch_array($result)) {
$cat[] = $r;
}
return $cat;
}
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