php下封装较好的数字分页方法

/** 
* 获取页码导航HTML 
* @param $pageNum：当前页码 
* @param $pageSize：每页数量 
* @param $rowCount：记录总数 
* @param $navUrl：链接页面URL 
*/ 
function getNavHtml($pageNum,$pageSize,$rowCount,$navUrl){ 
$pageCount = (int)($rowCount/$pageSize); //总页数 
if ($rowCount % $pageSize >0){ 
$pageCount++; 
} 
if ($pageNum>$pageCount){ 
$pageNum = 1; 
} 
$firstNav = "<a href=\"{$navUrl}page=1\">首页</a> "; 
$lastNav = "<a href=\"{$navUrl}page={$pageCount}\">尾页</a> "; 
$prevNav=""; 
$nextNav=""; 
if ($pageNum>1){ 
$navPageNum = $pageNum-1; 
$prevNav = "<a href=\"{$navUrl}page={$navPageNum}\">上一页</a> "; 
} 
if ($pageNum<$pageCount && $pageCount>1){ 
$navPageNum = $pageNum+1; 
$nextNav = "<a href=\"{$navUrl}page={$navPageNum}\">下一页</a> "; 
} 
$amongNav=""; //关键循环 
for ($i=1;$i<=5;$i++){ 
$navPageNum = $pageNum+ $i-3; 
if ($navPageNum>0 && $navPageNum<=$pageCount){ 
$navCss = $navPageNum == $pageNum?" class=\"hover\"":""; 
$amongNav.="<a href=\"{$navUrl}page={$navPageNum}\" $navCss>{$navPageNum}</a> "; 
} 
} 
return $firstNav.$prevNav.$amongNav.$nextNav.$lastNav." ".$pageNum."/".$pageCount." 共有[".$rowCount."]条数据"; 
} 
}