帝国cms教程无限循环导航栏目，当前高亮

<li class="<?=$GLOBALS[navclassid]==0?'current':''?>"><a href="[!--news.url--]">首页</a></li>
                        
<?php
$sql=$empire->query("select classid,classname,bname,islast from {$dbtbpre}enewsclass where bclassid=0 and showclass=0 order by myorder,myorder asc");
    while($s=$empire->fetch($sql)){
            $tclass="";
        $fr=explode('|',$class_r[$GLOBALS[navclassid]][featherclass]);
        $topbclassid=$fr[1]?$fr[1]:$GLOBALS[navclassid];
        if($topbclassid==$s[classid]){
                $tclass='current';
        }
        $classurl=sys_ReturnBqClassname($s,9);
        
        echo '<li class="'.$tclass.'"><a href="'.$classurl.'">'.$s[bname].'</a>';
        if(!$s[islast]){
                $sql2=$empire->query("select classid,classname,bname from {$dbtbpre}enewsclass where bclassid=$s[classid] and showclass=0 order by myorder,myorder asc");
            $str="";
            while($s2=$empire->fetch($sql2)){
                                $tclass2="";
                                if($GLOBALS[navclassid]==$s2[classid]){
                                        $tclass2='curr';
                                }
                    $classurl2=sys_ReturnBqClassname($s2,9);
                    $str.='<a class="'.$tclass2.'" href="'.$classurl2.'">'.$s2[bname].'</a>';
            }
            echo '<div class="submenu-nav">'.$str.'</div>';
        }
        echo '</li>';
    }
?>