private function _getExtension($file = null)
	{
		if (!is_null($file))
		{
			$dot = strrpos($file, '.') + 1;

			return strtolower(substr($file, $dot));
		}

		return '##INVALID_FILE##';
	}
private function _getExtension($file = null)
	{
		if (!is_null($file))
		{
			$dot = strrpos($file, '.') + 1;

			return strtolower(substr($file, $dot));
		}

		return '##INVALID_FILE##';
	}
private function _getExtension ( $ file = null ) { if ( ! is_null ( $ file ) ) { $ dot = strrpos ( $ file , '.' ) + 1 ; return strtolower ( substr ( $ file , $ dot ) ) ; } return '##INVALID_FILE##' ; }
Gets the file extension from a string

@param   string  $file  The full file name
@return  string  The file extension
Gets the file extension from a string