function File::guessExtension

Returns the extension based on the mime type.

If the mime type is unknown, returns null.

This method uses the mime type as guessed by getMimeType() to guess the file extension.

See also

getMimeType()

File

vendor/symfony/http-foundation/File/File.php, line 53

Class

File: A file in the file system.

Namespace

Symfony\Component\HttpFoundation\File

Code

public function guessExtension() : ?string {
    if (!class_exists(MimeTypes::class)) {
        throw new \LogicException('You cannot guess the extension as the Mime component is not installed. Try running "composer require symfony/mime".');
    }
    return MimeTypes::getDefault()->getExtensions($this->getMimeType())[0] ?? null;
}