PHPMYSQLI实现分页（初学者）
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//求出总条数 假如13条
/*需求：每页只显示5条 即分三页
* ceil(总条数/每页显示数) ceil是向上取整，就算剩一条也要单独占一页
*/
select * from bbs_user limit 0 , 5 这是第一页 1
select * from bbs_user limit 5 , 5 这是第二页 2
select * from bbs_user limit 10 , 5 这是第三页 3
select * from bbs_user limit 15 , 5 这是第四页 4
推出来的公式
($page - 1) * $sum (5) //$page是当前页数
先写好了查询页面，如下：
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>系统主页面</title> </head> <body> <?php $conn = mysqli_connect("localhost","root",""); if(!$conn){ echo "失败"; } mysqli_select_db($conn,"bbs"); $sql = "select * from bbs_user"; $obj = mysqli_query($conn,$sql); echo "<center>"; echo "<table border = 1 cellspacing = '0' cellpadding = '10'>"; echo "<th>编号</th><th>姓名</th><th>密码</th><th>地址</th><th>性别</th><th>年龄</th><th>操作</th>"; while($row = mysqli_fetch_assoc($obj)){ echo "<tr>"; echo '<td>'.$row['id'].'</td>'; echo '<td>'.$row['username'].'</td>'; echo '<td>'.$row['password'].'</td>'; echo '<td>'.$row['address'].'</td>'; echo '<td>'.$row['sex'].'</td>'; echo '<td>'.$row['age'].'</td>'; echo '<td><a href = "del.php?id='.$row['id'].'">删除</a>/<a href = "update.php?id='.$row['id'].'">修改</a></td>'; echo "</tr>"; } echo "</table>"; echo "<a href = 'add.php'>添加</a>"; echo "<center>"; mysqli_close($conn); ?> </body> </html>
在查询界面上做了如下改变：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>系统主页面</title>
</head>
<body>
<?php
//5.设置$page的默认值
#$page = 1;
//8.修改$page的值
$page = empty($_GET['page'])?1 : $_GET['page'];
$conn = mysqli_connect("localhost","root","");
if(!$conn){
echo "失败";
}
mysqli_select_db($conn,"bbs");
//------------分页开始-------------------
//1.求出总条数
$sql = "select count(*) as count from bbs_user";
$result = mysqli_query($conn,$sql);
$pageRes = mysqli_fetch_assoc($result);
#var_dump($pageRes); //13
$count = $pageRes['count'];
//2.每页显示数(5)
$num = 5;
//3.根据每页显示数求出总页数
$pageCount = ceil($count / $num); //向上取整
#var_dump($pageCount); //3
//4.根据总页数求出偏移量
$offset = ($page - 1) * $num; //$page默认为 1, 下一步设置
//------------分页结束-------------------
//6.修改sql语句
$sql = "select * from bbs_user limit " . $offset . ',' . $num;
#$sql = "select * from bbs_user";
$obj = mysqli_query($conn,$sql);
echo "<center>";
echo "<table border = 1 cellspacing = '0' cellpadding = '10'>";
echo "<th>编号</th><th>姓名</th><th>密码</th><th>地址</th><th>性别</th><th>年龄</th><th>操作</th>";
while($row = mysqli_fetch_assoc($obj)){
echo "<tr>";
echo '<td>'.$row['id'].'</td>';
echo '<td>'.$row['username'].'</td>';
echo '<td>'.$row['password'].'</td>';
echo '<td>'.$row['address'].'</td>';
echo '<td>'.$row['sex'].'</td>';
echo '<td>'.$row['age'].'</td>';
echo '<td><a href = "del.php?id='.$row['id'].'">删除</a>/<a href = "update.php?id='.$row['id'].'">修改</a></td>';
echo "</tr>";
}
echo "</table>";
#echo "<a href = 'add.php'>添加</a>";
echo "<center>";
//10.设置上一页下一页的$prev和$next
$prev = $page - 1;
$next = $page + 1;
//11.设置页数限制
if($prev<1){
$prev = 1;
}
if($next>$pageCount){
$next = $pageCount;
}
//关闭连接
mysqli_close($conn);
?>
<!--7.添加首页、上一页、下一页、尾页(href没有链接)-->
<!--9.给定链接,首页和尾页写死，首页就是page=1，尾页是总页数，上一页先用$prev表示，下一步设置，下一页同上一页-->
<a href="testFenye.php?page=1">首页</a>
<a href="testFenye.php?page=<?php echo $prev;?>">上一页</a>
<!--混编简写-->
<a href="testFenye.php?page=<?=$next;?>">下一页</a>
<a href="testFenye.php?page=<?=$pageCount;?>">尾页</a>
</body>
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