帝国CMS使用用户自定义函数取发表的新闻数

<?php
function user_newstotal($userid){
global $empire,$class_r,$dbtbpre;
$query="select count(*) as total from {$dbtbpre}ecms_news WHERE userid=".$userid." ";
$num=$empire->gettotal($query);
echo $num;
}
?>