string getClientOriginalExtension() Returns the original file extension. It is extracted

string|null getClientOriginalName() Returns the original file name. It is extracted from

class MimeTypeExtensionGuesser implements

string guess(string $path) Guesses the mime type of the file with the given path.

class UploadedFile extends File

interface ExtensionGuesserInterface Guesses the file extension corresponding to a given mime type

File move(string $directory, string $name

string getErrorMessage() Returns an informative upload error message.

bool isValid() Returns whether the file was uploaded successfully.

class File extends SplFileInfo