fileinfo returns text/xml for some svg files

[ostrolucky]

Description

The following code:

<?php
echo (new \finfo(\FILEINFO_MIME_TYPE))->file('svgfile.svg');

Resulted in this output:

text/xml

But I expected this output instead:

image/svg+xml

Here are example files:

I've reported same bug for file command line utility and they fixed it quickly: https://bugs.astron.com/view.php?id=470 (but I don't know how does the fix look like, I failed finding source code for their HEAD version)

PHP Version

8.2.8

Operating System

MacOS, Ubuntu

[usarise]

All because of unicode format, any SVG in UTF-16 encoding is recognized as text/xml,
encoding="UTF-16" from example does not matter, it is the initial bytes of the file that are important.

And it doesn't look like it's a mistake

[Girgias]

This seems to be fixed upstream

[ostrolucky]

Which upstream? Does this mean this will be fixed in next PHP patch version?

[usarise]

@ostrolucky fixed upstream file/file@006b37f
No, PHP bundled magic database not yet updated.
Backport fix probably won't happen...

[usarise]

@ostrolucky You can use a patched file https://raw.githubusercontent.com/file/file/master/magic/Magdir/sgml

<?php
echo (new \finfo(\FILEINFO_MIME_TYPE, 'sgml'))->file('svgfile.svg');

[Girgias]

@ostrolucky fixed upstream file/file@006b37f No, PHP bundled magic database not yet updated. Backport fix probably won't happen...

I don't know what @weltling's process is for updating the bundled library, but he seems to apply fixes onto stable releases, but the last syncing was done on the 1st of July.

Part of the process is described here: #11298 (comment) so if someone wants to make a PR.