Symfony\Component\HttpFoundation\File\MimeType\MimeTypeGuesser

A singleton mime type guesser.

By default, all mime type guessers provided by the framework are installed
(if available on the current OS/PHP setup).

You can register custom guessers by calling the register() method on the
singleton instance. Custom guessers are always called before any default ones.

$guesser = MimeTypeGuesser::getInstance();
$guesser->register(new MyCustomMimeTypeGuesser());

If you want to change the order of the default guessers, just re-register your
preferred one as a custom one. The last registered guesser is preferred over
previously registered ones.

Re-registering a built-in guesser also allows you to configure it:

$guesser = MimeTypeGuesser::getInstance();
$guesser->register(new FileinfoMimeTypeGuesser('/path/to/magic/file'));