php上传下载文件管理系统

Question

大家好，我试图在 php 上创建一个文件管理系统，但是当我尝试下载上传的图像时，它确实打开并说图像不支持

这是我的下载代码

<?php 

include_once 'includes/dbh.inc.php';

if (isset($_GET['id'])) {
    $id = $_GET['id'];
    // fetch file to download from database
    $sql = "SELECT * FROM items WHERE id = $id";
    $result = mysqli_query($conn, $sql);

    $file = mysqli_fetch_assoc($result);
    $filepath = 'uploads/' . $file['filename'];


    print_r($file);
    if (file_exists($filepath)) {
        header('Content-Description: File Transfer');
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename=' . basename($filepath));
        header('Expires: 0');
        header('Cache-Control: must-revalidate');
        header('Pragma: public');
        header('Content-Length: ' . filesize('uploads/' . $file['filename']));
        readfile('uploads/' . $file['filename']);

        // Now update downloads count
        $newCount = $file['downloaded'] + 1;
        $updateQuery = "UPDATE items SET downloaded=$newCount WHERE id=$id";
        mysqli_query($conn, $updateQuery);
        exit;
    }
}