PHP を使用してシンプルなオンライン音楽ダウンロードおよび再生システムを実装する方法

CREATE TABLE `songs` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) NOT NULL,
  `artist` varchar(255) NOT NULL,
  `file` varchar(255) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

<?php
if(isset($_POST['submit'])){
    $name = $_POST['name'];
    $artist = $_POST['artist'];
    $file = $_FILES['file']['name'];
    $targetDir = "./uploads/";
    $targetFile = $targetDir . basename($file);
    
    // 保存文件
    if(move_uploaded_file($_FILES['file']['tmp_name'], $targetFile)){
        // 将文件信息保存到数据库
        $conn = new mysqli('localhost', 'root', '', 'music');
        $sql = "INSERT INTO songs (name, artist, file) VALUES ('$name', '$artist', '$file')";
        $conn->query($sql);
        $conn->close();
        echo "上传成功！";
    }else{
        echo "上传失败！";
    }
}
?>
<form method="POST" action="" enctype="multipart/form-data">
    歌曲名：<input type="text" name="name" required><br>
    歌手：<input type="text" name="artist" required><br>
    音乐文件：<input type="file" name="file" required><br>
    <input type="submit" name="submit" value="上传">
</form>

<?php
$conn = new mysqli('localhost', 'root', '', 'music');
$sql = "SELECT * FROM songs";
$result = $conn->query($sql);
?>

<table>
    <tr>
        <th>歌曲名</th>
        <th>歌手</th>
        <th>操作</th>
    </tr>
    <?php while($row = $result->fetch_assoc()): ?>
    <tr>
        <td><?php echo $row['name']; ?></td>
        <td><?php echo $row['artist']; ?></td>
        <td>
            <a href="play.php?id=<?php echo $row['id']; ?>">播放</a>
            <a href="download.php?file=<?php echo $row['file']; ?>">下载</a>
        </td>
    </tr>
    <?php endwhile; ?>
</table>

<?php
$id = $_GET['id'];
$conn = new mysqli('localhost', 'root', '', 'music');
$sql = "SELECT * FROM songs WHERE id=$id";
$result = $conn->query($sql);
$row = $result->fetch_assoc();
$music = "./uploads/" . $row['file'];
?>

<audio controls autoplay>
    <source src="<?php echo $music; ?>" type="audio/mpeg">
    你的浏览器不支持音频播放。
</audio>

<?php
$file = $_GET['file'];
$filepath = './uploads/' . $file;
header('Content-Type: application/octet-stream');
header('Content-disposition: attachment; filename="'.$file.'"');
header('Content-Length: ' . filesize($filepath));
readfile($filepath);
?>