以下为分页函数的封装:
<?php /** * 分页函数 */ if (!function_exists('func_page')) { /** * @param $db * @param $table * @param int $page * @param int $num * @return array */ function func_page($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); //计算总页数 $total_Number = mysqli_query($db,"SELECT COUNT(*) FROM {$table};"); list($total) = mysqli_fetch_row($total_Number); //当前从记录总数在$total中 list()把数组里面的结果转成变量 $pages = ceil($total/$num); //echo $pages; //返回当前的分页结果集和总页数 return ['rows'=>$rows, 'pages'=>$pages]; } }
上述封装函数会返回一个数组结果集 包含retrieve出来的数组集和总页数,然后我们把这些数据向前段输出:
<!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>作业——手机售价表</title> <style> table,th,td{ border: 1px solid black; } table{ border-collapse: collapse; width: 70%; margin: 30px auto; text-align: center; } table th{ background-color: lightskyblue; } 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 require 'lib/func_page.php'; $db = mysqli_connect('localhost', 'root','root','php'); $page = isset($_REQUEST['p'])? $_REQUEST['p'] : 1 ; //分页函数需要四个参数: 数据库的连接$db, 表名$table, 当前页$page, 显示数量 $num $num = 5; $table = 'products'; $data = func_page($db,$table,$page,$num); $rows = $data['rows']; $pages = $data['pages']; //如果当前页数为0, 强制变1 $page = ($page<=0)? 1 : $page; //如果大于总页数 将当前页改为总页数 $page = ($page>=$pages)? $pages : $page; ?> <table> <caption><h2>手机售价表</h2></caption> <tr> <th>ID</th> <th>Name</th> <th>Price</th> </tr> <?php foreach ($rows as $row): ?> <tr> <td><?php echo $row['ID']; ?></td> <td><?php echo $row['name']; ?></td> <td><?php echo $row['price']; ?></td> </tr> <?php endforeach; ?> </table> <h3> <?php if ($page!=1):?> <a href="http://www.php.io/0427/demo8.php?p=1">首页</a> <a href="http://www.php.io/0427/demo8.php?p=<?php echo $page-1;?>">上一页</a> <?php endif;?> <!-- 中间页码数 --> <?php for($i=1;$i<=$pages;$i++): ?> <a class="<?php if ($page==$i) echo 'active';?>" href="http://www.php.io/0427/demo8.php?p=<?php echo $i; ?>"><?php echo $i; ?></a> <?php endfor;?> <?php if ($page!=$pages):?> <a href="http://www.php.io/0427/demo8.php?p=<?php echo $page+1 ;?>">下一页</a> <a href="http://www.php.io/0427/demo8.php?p=<?php echo $pages;?>">尾页</a> <?php endif;?> <!-- 页面直接跳转 --> <form action="" method="get"> 第 <select name="p" id=""> <?php for($i=1;$i<=$pages;$i++): ?> <option value="<?php echo $i; ?>" <?php if ($page==$i) echo 'selected'?>><?php echo $i; ?></option> <?php endfor;?> </select> 页 <button>跳转</button> </form> </h3> </body> </html>
数据库信息如下:
效果图如下: