SplFileInfo empty getBasename with more than on slash after PHP 8.1.1

[deniskulygin]

Description

The following code:

<?php

$file = new \SplFileInfo('/dir/anotherdir/basedir//');
var_dump($file->getBasename());

https://3v4l.org/vAh4f#v8.1.0

Resulted in this output:

string(0) ""

But I expected this output instead:

string(7) "basedir"

Before PHP 8.1.1 you got basename even with 2 slashes.

PHP Version

8.1.1

Operating System

No response

[ndossche]

I think it's coming up with the empty string because it thinks the file path is between the two slashes...
I'll run a bisect.
EDIT: first bad commit is 13e4ce3