php分页的实现

<?php
$link=mysql_connect('localhost','','');
mysql_select_db('mzdly');
mysql_query('set names utf8');

$Page_size=3;

$result=mysql_query('select * from article');
$count = mysql_num_rows($result);
$page_count = ceil($count/$Page_size);

$init=1;
$page_len=7;
$max_p=$page_count;
$pages=$page_count;

//判断当前页码
if(empty($_GET['page'])||$_GET['page']<0){
$page=1;
}else {
$page=$_GET['page'];
}

$offset=$Page_size*($page-1);
$sql="select * from article limit $offset,$Page_size";
$result=mysql_query($sql,$link);
require_once('getpager.php');
while ($row=mysql_fetch_array($result)) {
echo $row['id'];
echo $row['title'];}
echo $key;
?>

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<?php
$page_len = ($page_len%2)?$page_len:$pagelen+1;//页码个数
$pageoffset = ($page_len-1)/2;//页码个数左右偏移量

$key='<div class="page">';
$key.="<span>$page/$pages</span> "; //第几页,共几页
if($page!=1&&isset($page)){
$key.="<a href=\"".$_SERVER['PHP_SELF']."?page=1\">第一页</a> "; //第一页
$key.="<a href=\"".$_SERVER['PHP_SELF']."?page=".($page-1)."\">上一页</a>"; //上一页
}else {
$key.="第一页 ";//第一页
$key.="上一页"; //上一页
}
if($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){
$key.='<span>'.$i.'</span>';
} else {
$key.=" <a href=\"".$_SERVER['PHP_SELF']."?page=".$i."\">".$i."</a>";
}
}
if($page!=$pages){
$key.=" <a href=\"".$_SERVER['PHP_SELF']."?page=".($page+1)."\">下一页</a> ";//下一页
$key.="<a href=\"".$_SERVER['PHP_SELF']."?page={$pages}\">最后一页</a>"; //最后一页
}else {
$key.="下一页 ";//下一页
$key.="最后一页"; //最后一页
}
$key.='</div>';
?>