Would be nice to add a method to this API here

https://api.symfony.com/3.1/Symfony/Component/Finder/SplFileInfo.html

like:

public function getFilenameWithoutExtension() { // or whatever function name makes sense
  return $this->getBasename('.' . $this->getExtension());
}

Right now the situation is so that if you pass no argument to getBasename you get the same result as getFilename. Which in my opinion is a mistake in SPL because when you look at pathinfo you can see that filename doesn't include the extension