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php入门学习知识点二 PHP简单的分页过程与原理_PHP

WBOY
Release: 2016-06-01 12:14:50
Original
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require '../inc/conn.php';
?>

//初始参数设置
$pagesize=5 ; //分页大小
$pagenum=1 ; //默认为第一页


//第一步:获取当前是第几页
if($_GET){
if($_GET['pagenum']){
$pagenum=$_GET['pagenum'];
}
}
//第二步:获取当前分页的内容列表

$sql="Select * From message limit ".($pagenum-1)*$pagesize.",$pagesize ";
$result=mysql_query($sql);

while(($row=mysql_fetch_array($result))==true){
echo '


'.$row["title"].'';
}

//第三步:获取记录数
$sql="Select id From message";
$result=mysql_query($sql);
$rownum=mysql_num_rows($result);

//第四步:记算分页数
if(($rownum%$pagesize)==0){
$pagecount=$rownum/$pagesize;
}else{
$pagecount=(int)($rownum/$pagesize);
}

//第五步:得到分页链接
$url=$_SERVER["REQUEST_URI"];
$url=parse_url($url);
$url=$url["path"];

//第六步:输出分页链接

if($pagenum==1){
echo "[第一页] [上一页]";
}else{
echo "[第一页] [上一页]";
}


if($pagecount==$pagenum){
echo "[下一页] [最后一页]";
}else{
echo "[下一页] [最后一页]";
}

?>
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