function show_page($count,$page,$page_size)
{
$page_count = ceil($count/$page_size); //计算得出总页数
$init=1;
$page_len=7;
$max_p=$page_count;
$pages=$page_count;
//判断当前页码
$page=(empty($page)||$page<0)?1:$page;
//获取当前页url
$url = $_SERVER['REQUEST_URI'];
//去掉url中原先的page参数以便加入新的page参数
$parsedurl=parse_url($url);
$url_query = isset($parsedurl['query']) ? $parsedurl['query']:'';
if($url_query != ''){
$url_query = preg_replace("/(^|&)page=$page/",'',$url_query);
$url = str_replace($parsedurl['query'],$url_query,$url);
if($url_query != ''){
$url .= '&';
}
} else {
$url .= '?';
}
//分页功能代码
$page_len = ($page_len%2)?$page_len:$page_len+1; //页码个数
$pageoffset = ($page_len-1)/2; //页码个数左右偏移量
$navs='';
if($pages != 0){
if($page!=1){
$navs.="<a href=\"".$url."page=1\">首页</a> ";//第一页
$navs.="<a href=\"".$url."page=".($page-1)."\">上页</a>";//上一页
} else {
$navs .= "<span class='disabled'>首页</span>";
$navs .= "<span class='disabled'>上页</span>";
}
if($pages>$page_len)
{
//如果当前页小于等于左偏移
if($page<=$pageoffset){
$init=1;
$max_p = $page_len;
}
else //如果当前页大于左偏移
{
//如果当前页码右偏移超出最大分页数
if($page+$pageoffset>=$pages+1){
$init = $pages-$page_len+1;
}
else
{
//左右偏移都存在时的计算
$init = $page-$pageoffset;
$max_p = $page+$pageoffset;
}
}
}
for($i=$init;$i<=$max_p;$i++)
{
if($i==$page){$navs.="<span class='current'>".$i.'</span>';}
else {$navs.=" <a href=\"".$url."page=".$i."\">".$i."</a>";}
}
if($page!=$pages)
{
$navs.=" <a href=\"".$url."page=".($page+1)."\">下页</a> ";//下一页
$navs.="<a href=\"".$url."page=".$pages."\">末页</a>";//最后一页
} else {
$navs .= "<span class='disabled'>下页</span>";
$navs .= "<span class='disabled'>末页</span>";
}
echo "$navs";
}
}
