下载存储为 BLOB 的图像不起作用

Question

我的脚本返回一个具有正确名称但没有任何文件类型或扩展名的文件。当我打开这个文件时，它只显示非常长的几乎无限的字符串。我想返回一个图像（.png 文件）并在

中为其指定了 MIME 类型

header("内容类型：图片/png"); 我的脚本是：

    $query = "SELECT * " ."FROM images WHERE filename = '$name2'";
$result = mysqli_query($connect,$query) 
       or die('Error, query failed');
list($file, $content) = mysqli_fetch_array($result);
header("Content-type: image/png");
header("Content-Disposition: attachment; filename=$file");
ob_clean();
flush();
echo $content;
mysqli_close($connect);
exit;

而回显的文件就是这样的无限字符串：

¸A

它不会将 BLOB 转换为正确的文件类型 (.png)

Answer 1

<?php
$connection =  mysqli_connect("localhost","root"," ",your_database)
           or die('Database Connection Failed');
mysqli_set_charset($connection,'utf-8');

$id = 1;

 // Use a prepared statement in production to avoid SQL injection;
 // we can get away with this here because we're the only ones who
 // are going to use this script.
$query = "SELECT * " ."FROM images WHERE filename = '$name2'";
$result = mysqli_query($connect,$query) 
   or die('Error, query failed');
list($id, $file, $type, $size,$content) = mysqli_fetch_array($result);
header("Content-length: $size");
header("Content-type: $type");
header("Content-Disposition: attachment; filename=$file");
ob_clean();
flush();
echo $content;
mysqli_close($connection);
exit;

?>

对我有用！！