Correction status:Uncorrected
Teacher's comments:
4月27日作业
1.封装函数,代码如下:
<?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 {$table}"); list($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]; } }
点击 "运行实例" 按钮查看在线实例
2.分页部分代码:
<!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,应用到商品信息表</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的记录 //导入分页函数库 require 'lib/func_page.php'; $db = mysqli_connect('localhost','root','root','aixuexi'); $page = isset($_GET['p']) ? $_GET['p'] : 1; $num = 5; $table = 'phones'; //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 /********要添加以下代码**********/ //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 : $page; ?> <table> <caption><h2>手机信息表</h2></caption> <tr> <th>ID</th> <th>手机品牌</th> <th>手机型号</th> <th>进价</th> <th>售价</th> <th>库存</th> </tr> <?php foreach ($rows as $row): ?> <tr> <td><?php echo $row['phone_id']; ?></td> <td><?php echo $row['phone_brand']; ?></td> <td><?php echo $row['phone_name']; ?></td> <td><?php echo $row['phone_bid']; ?></td> <td><?php echo $row['phone_price']; ?></td> <td><?php echo $row['inventory']; ?></td> </tr> <?php endforeach;?> </table> <h3> <!-- 当前是第一页的时候,上一页和首页链接应该不显示--> <?php if($page != 1): ?> <a href="http://www.aixuexi.com/test/0427_benren/fenye.php?p=1">首页</a> <a href="http://www.aixuexi.com/test/0427_benren/fenye.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://www.aixuexi.com/test/0427_benren/fenye.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://www.aixuexi.com/test/0427_benren/fenye.php?p=<?php echo $page+1; ?>">下一页</a> <a href="http://www.aixuexi.com/test/0427_benren/fenye.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>
点击 "运行实例" 按钮查看在线实例
3.运行结果: