使用PHP将base64映像保存到MySQL blob字段

Question

I have this customer that saves files as base64 into a MEDIUMBLOB field (please don't ask why).

The files is saved like this:

$file      = file_get_contents($_FILES['file']['tmp_name']);
$file      = base64_encode($file);
$file      = mysql_real_escape_string($file);
$file_name = mysql_real_escape_string($_FILES['file']['name']);
$file_ext  = mysql_real_escape_string($_FILES['file']['type']);

$sql = "INSERT INTO $file_table_name (file, file_name, file_ext) VALUES ('$file', '$file_name', '$file_ext')";

This is the code I'm using to force download the file:

header('Content-type: ' . $data->file_ext);
header('Content-Disposition: attachment;filename="' . $data->file_name . '"');
echo base64_decode($data->file);
die();

For some reason, this works fine with PDF files, but not image files. When I try to open the file in Windows Preview it says: "Windows Photo Viewer can't open this picture because the file appears to be damaged, corrupted or is too large". The original file is ~150KB.

If I do this;

echo '<img src="data:' . $data->file_ext . ';base64,'.$data->file.'" />';
die();

...the image looks fine and I'm able to save the image (save as) without issues.

Anyone know what I'm doing wrong? Am I missing any headers?

Update with values from the DB:

file_name: 'test.png'
file_ext: 'image/png'
file: https://gist.githubusercontent.com/horgen/25298f2689d9aed865db/raw/gistfile1.txt

The original file: http://cl.ly/image/2o3X3u3a0V0S
The encoded file: http://cl.ly/image/1S3K3v0x0U0p

Answer 1

尝试使用readfile（base64_decode（$ data-> file））而不是echo。

Answer 2

You could try

echo base64_decode(str_replace(' ', '+', $data->file));

See the PHP manual page for base64_decode() and also the comments on the page.

Answer 3

Yeah.. This is akward.. I found the problem. This is a Wordpress site and I have this functions.php file where I include all my functions. For some reason the previous developer on this project included a php file inside functions.php. The included file had some whitespace/tab before the "php"-tag and this generated a newline in the decoded file :S

Anyways, thank you all for trying to help me :)