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.
@return string|null The guessed extension or null if it cannot be guessed
@see MimeTypes @see getMimeType()
See Implementation
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.
@return string|null The guessed extension or null if it cannot be guessed
@see MimeTypes @see getMimeType()