分页函数，封装常用操作 - 作业

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<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        table,th,td{
            border:1px solid black;
        }
        table{
            border-collapse: collapse;
            width: 70%;
            margin: 30px auto;
            text-align: center;
        }
        h3{
            text-align: center;
        }
        h3 a{
            text-decoration: none;
        }
    </style>
</head>
<body>
<?php
$db = mysqli_connect('127.0.0.1','root','root');
mysqli_select_db($db,'php');
$num = 5;
$page = isset($_GET['p'])? $_GET['p']:1;
$offset = ($page-1) * $num;
$sql = "SELECT * FROM staff LIMIT {$offset},{$num}";
$res = mysqli_query($db,$sql);

$rows = mysqli_fetch_all($res,MYSQLI_ASSOC);
//计算总页数
$number = mysqli_query($db,'SELECT COUNT(*) FROM staff');
list ($total) = mysqli_fetch_row($number);//当前记录总数在$total
$pages = ceil($total / $num);
//如果当前页数为0，强制为1

$page = ($page == 0) ? 1:$page;
$page = ($page>$pages) ? $pages:$page;

?>
<table>
    <caption><h2>员工信息表</h2></caption>
    <tr>
        <th>ID</th>
        <th>姓名</th>
        <th>性别</th>
        <th>年龄</th>
        <th>工资</th>
    </tr>
    <?php
    foreach ($rows as $row):
        ?>
        <tr>
            <td><?php echo $row['staff_id']?></td>
            <td><?php echo $row['name']?></td>
            <td><?php echo $row['sex']?></td>
            <td><?php echo $row['age']?></td>
            <td><?php echo $row['salay']?></td>
        </tr>
    <?php
    endforeach;
    ?>
</table>
<h3>
    <a href="http://127.0.0.1/515/demo5.php?p=1">首页</a>
    <a href="http://127.0.0.1/515/demo5.php?p=<?php echo $page;?>">上一页</a>

    <?php
    for ($i=1;$i<=$pages;$i++):;
        ?>
        <a href="http://127.0.0.1/515/demo5.php?p=<?php echo $i?>"><?php echo $i?></a>

    <?php
    endfor;
    ?>

    <a href="http://127.0.0.1/515/demo5.php?p=<?php echo $page;?>">下一页</a>
    <a href="http://127.0.0.1/515/demo5.php?p=<?php echo $pages; ?>">尾页</a>
</h3>
</body>
</html>

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