演示单文件上传与多文件上传、演示简单分页操作,并理解分页所需参数的意思

<?php
// printf('<pre>%s</pre>',print_r($_FILES,true));
// 1. 实例演示单文件上传与多文件上传 
// 单文件
if(isset($_FILES['myfile'])){
    extract($_FILES['myfile']);
    if($error===0){
        $ext = pathinfo($name)['extension'];
        $dest = 'uploads/'. md5($name) . '.' . $ext;
        if(move_uploaded_file($tmp_name,$dest)){
            echo '<span style="color:green">上传成功</span><br>';
            echo "<img src=$dest width='200'>";
        }
    }
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>单文件上传</title>
</head>
<body>
    <form action="" method="post" enctype="multipart/form-data">
        <fieldset>
            <legend>单文件上传</legend>
            <input type="file" name="myfile">
            <button>上传</button>
        </fieldset>
    </form>
</body>
</html>

<?php
//printf('<pre>%s</pre>',print_r($_FILES,true));
// 多文件上传
if(isset($_FILES['myfile'])){
    foreach($_FILES['myfile']['error'] as $key=>$error){
        if($error===0){
            $name = $_FILES['myfile']['name'][$key];
            $tmpName = $_FILES['myfile']['tmp_name'][$key];
            $desc = 'uploads/'. md5($name).'.'. pathinfo($name)['extension'];
            move_uploaded_file($tmpName,$desc);
            echo '<span style="color:green">上传成功</span><br>';
            echo "<img src=$desc width='200'><br>";
        }
    }
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>多文件上传</title>
</head>
<body>
    <form action="" method="post" enctype="multipart/form-data">
        <fieldset>
            <legend>多文件上传</legend>
            <input type="file" name="myfile[]" multiple>
            <button>上传</button>
        </fieldset>
    </form>
</body>
</html>

<?php
$p = $_GET['p']??1;
// 2. 实例演示简单分页操作,并理解分页所需参数的意思
$db = new PDO('mysql:dbname=phpedu','root','root');
// 数据表总数量:Total
$sql = 'SELECT COUNT(*) AS `total` FROM `staff`';
$stmt = $db->prepare($sql);
$stmt->execute();
$stmt->bindColumn('total', $total);
$stmt->fetch(PDO::FETCH_ASSOC);
// 单页显示数量:num=5
$num = 5;
// 分页数量
$pages = ceil($total/$num);
// 计算偏移量
$offset = ($p-1)*$num;
$sql = "SELECT * FROM `staff` LIMIT $num OFFSET $offset";
$stmt = $db->prepare($sql);
$stmt->execute();
$staffs = $stmt->fetchAll(PDO::FETCH_ASSOC);
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>分页操作</title>
    <style>
        table {
            width: 400px;
            border-collapse: collapse;
            text-align: center;
        }
        table th,
        table td {
            border: 1px solid;
            padding: 5px;
        }
        table thead {
            background-color: lightcyan;
        }
        table caption {
            font-size: larger;
            margin-bottom: 8px;
        }
        p>a {
            text-decoration: none;
            color: #555;
            border: 1px solid;
            padding: 5px 10px;
            margin: 10px 2px;
        }
        .active {
            background-color: seagreen;
            color: white;
            border: 1px solid seagreen;
        }
    </style>
</head>
<body>
    <table>
        <caption>员工信息表</caption>
        <thead>
            <tr>
                <th>ID</th>
                <th>姓名</th>
                <th>性别</th>
                <th>邮箱</th>
            </tr>
        </thead>
        <tbody>
        <?php foreach ($staffs as $staff) : extract($staff) ?>
                <tr>
                    <td><?= $id ?></td>
                    <td><?= $name ?></td>
                    <td><?= $gender ?></td>
                    <td><?= $email ?></td>
                </tr>
            <?php endforeach ?>
        </tbody>
    </table>
    <p>
    <?php for ($i = 1; $i <= $pages; $i++) : ?>
            <?php
            $url = $_SERVER['PHP_SELF'] . '?p=' . $i;
            $active = $i == $_GET['p'] ? 'active' : null;
            ?>
            <a href="<?= $url ?>" class="<?= $active ?>"><?= $i ?></a>
        <?php endfor ?>
    </p>
</body>
</html>

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