分页函数-2018年05月03日23时50分 - 作业管理

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index.php

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>分页</title>
   <style>
        table,th,td {
            border: 1px solid black;
        }
        table th {
            background-color: lightskyblue;
        }
        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;

            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记录
  // 导入分野函数库
  require './func_page.php';

  $db = mysqli_connect('127.0.0.1', 'gakkispy', 'password', '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);
  // 当前分页数据
  $rows = $data['rows'];

  // 总页数
  $pages = $data['pages'];

  // 如果当前变成为了0,则强制修改为1,否则就是当前页数
  
  // 如果大于总页数,则强制修改为总页数,否则就是当前页数
  if ($page == 0) {
    $page = 1;
  } else if ($page > $pages) {
    $page = $pages;
  }
  ?>

  <table>
    <caption><h2>员工信息表</h2></caption>
    <tr>
      <th>ID</th>
      <th>姓名</th>
      <th>年龄</th>
      <th>性别</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['age']; ?></td>
        <td><?php echo $row['sex']; ?></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="?p=1">首页</a>
      <a href="?p=<?php echo $page-1; ?>">上一页</a>
    <?php endif; ?>

    <!-- 页码 -->
    <?php for($i=1; $i<=$pages; $i++): ?>

      <a class="<?php if($_GET['p'] == $i ) {echo 'active';} ?>" href="?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="?p=<?php echo $page+1;?>">下一页</a>
      <a href="?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 $i; ?>" <?php if(isset($_GET['p']) && $_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

func_page.php 函数封装部分

<?php

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}");
  
  // 总记录数保存到变量$total中
  list($total) = mysqli_fetch_row($number);

  // 获取到总页数 $pages
  $pages = ceil($total / $num);

  // 返回当前分页数据与总页数

  return ['rows' => $rows, 'pages' => $pages];
  }
}

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