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老师批语：
前端代码实现员工信息查询
<!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;
}
table th{
background-color: skyblue;
}
h3{
text-align: center;
margin-left: 20px;
}
h3 a{
text-decoration: none;
border: 1px solid #3c3c3c;
padding: 5px;
background: #bce8f1;
}
h3 a:hover, .active {
color: red;
}
</style>
</head>
<body>
<?php
require 'lib/func_page.php';
$db = mysqli_connect('127.0.0.1', 'root', 'root');
mysqli_select_db($db, 'php');
//$num = 5;
$table = 'staff';
$page = isset($_GET['p'] )?$_GET['p']:1;
$data = func_page($db,$table,$page,$num=5);
$rows = $data['rows'];
$pages = $data['pages'];
?>
<table>
<caption>员工信息表</caption>
<tr>
<th>id</th>
<th>姓名</th>
<th>性别</th>
<th>年龄</th>
<th>工资</th>
</tr>
<?php foreach ($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 $row['salary']; ?></td>
</tr>
<?php endforeach; ?>
</table>
<h3>
<?php for ($i=1;$i<=$pages;$i++): ?>
<a <?php if ($page == $i )echo 'class = active'; ?> href="http://www.bb.io/php/180427/demo4.php?p=<?php echo $i ?>"><?php echo $i ?></a>
<?php endfor;?>
</h3>
</body>
</html>分页函数库封装，调用该函数执行分页
<?php
if (!function_exists('func_page')){
function func_page($db,$table,$page,$num=5){
$offset = ($page-1)*5;
$sql = "SELECT * FROM $table LIMIT $offset,$num ;";
$res = mysqli_query($db, $sql);
$rows = mysqli_fetch_all($res,MYSQLI_ASSOC);
$number = mysqli_query($db,"SELECT COUNT(*) FROM staff;");
list($total) = mysqli_fetch_row($number);
$pages = ceil($total / $num);
return ['rows'=>$rows, 'pages' => $pages,];
}
}
?>总结经过这学习，了解了数据库数据输出原理，以及计算总行数的过程
ceil函数向上取整，list函数的使用，使用全局变量$_GET 获取页数，当前页数高亮，以及分页跳转
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