4月27日作业—PHP封装分页函数 - 每日作业

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实例

<!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>封装分页函数,进一步规范代码,实现代码复用</title>
    <style>
        table,th,td {
            border: 1px solid black;
            line-height: 36px;
        }
        table th {
            background-color: lightskyblue;
            line-height: 36px;
        }
        table {
            border-collapse: collapse;
            width: 70%;
            margin: 30px auto;
            text-align: center;
        }
        h3 {
            text-align: center;
        }
        h3 a {
            text-decoration: none;
            margin-left: 10px;
            border: 1px solid black;
            line-height: 30px;

            display: inline-block;
            height: 30px;
            min-width: 30px;
            padding: 0 10px;
            background-color: lightgreen;
        }
        h3 a:hover, .active {
            background-color: red;
            color: white;
        }
        form {
            display: inline;
        }
    </style>
</head>
<body>
<?php
//连接数据库获取到全部的记录
//导入分页函数库
require 'lib/func_page.php';

$db = mysqli_connect('localhost','root','root','php');
$page = isset($_GET['p']) ? $_GET['p'] : 1;
$num = 5;
$table = 'staff';

//调用分页函数
$data = func_page($db,$table,$page,$num);
$rows = $data['rows'];  //当前分页数据
$pages = $data['pages'];  //总页数

/医院医院医院医院要添加以下代码医院医院医院医院医院/
//如果当前变成为了0,则强制修改为1,否则就是当前页数
$page = ($page == 0) ? 1 : $page;

//如果大于总页数,则强制修改为总页数,否则就是当前页数
$page = ($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'] ? '女' : '男'; ?></td>
            <td><?php echo $row['age']; ?></td>            
            <td><?php echo $row['salary']; ?></td>
        </tr>
    <?php endforeach;?>
</table>



<h3>
    <!--    当前是第一页的时候,上一页和首页链接应该不显示-->
    <?php if($page != 1): ?>
        <a href="http://0797.ltd/0427/demo6.php?p=1">首页</a>
        <a href="http://0797.ltd/0427/demo6.php?p=<?php echo $page-1; ?>">上一页</a>
    <?php endif; ?>


    <!--生成中间页码-->
    <?php for($i=1; $i<=$pages; $i++): ?>
        <!--高亮显示当前页码-->
        <a class="<?php if($_GET['p']==$i){echo 'active';}?>" href="http://0797.ltd/0427/demo6.php?p=<?php echo $i ?>"><?php echo $i ?></a>
    <?php endfor; ?>

    <!--当前已经是最后一页的时候,下一页和最后一页也应该不显示-->
    <?php if($page != $pages) :?>
        <a href="http://0797.ltd/0427/demo6.php?p=<?php echo $page+1; ?>">下一页</a>

        <a href="http://0797.ltd/0427/demo6.php?p=<?php echo $pages; ?>">尾页</a>
    <?php endif; ?>

    <!--实现页面的快速跳转-->
    <form action="" method="get">
        第
        <select name="p" id="">
            <?php for($i=1; $i<=$pages; $i++): ?>
                <!-- 循环输出全部页码,并锁定当前页-->
                <option value="<?php echo $i; ?>" <?php if($_GET['p']==$i){echo 'selected';} ?>><?php echo $i; ?></option>
            <?php endfor; ?>
        </select>
        页

        <button>跳转</button>
    </form>

</h3>


</body>
</html>

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实例

<?php
/医院
 *
 */
if (!function_exists('func_page'))
{
    function func_page($db,$table,$page=1,$num=5){
        $offset = ($page-1)*$num;
        $sql = "SELECT * FROM {$table} LIMIT {$offset}, {$num};";
        $res = mysqli_query($db,$sql);
        $rows = mysqli_fetch_all($res,MYSQLI_ASSOC);

    //获取总页数分2步:1.获取总记录数,2.再除以每次的显示数量,结果向上取整
        $number = mysqli_query($db,"SELECT COUNT(*) FROM {$table}");
        list($total) = mysqli_fetch_row($number); //总记录数保存到变量$total中
        $pages = ceil($total / $num);  //获取到总页数 $pages

        //返回当前分页数据与总页数
        return ['rows'=>$rows, 'pages'=>$pages];
    }
}

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QQ截图20180503164423.png

QQ截图20180503164435.png

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