public static function backtrace($trace = null)
	{
		$trace or $trace = debug_backtrace();

		if (\Fuel::$is_cli) {
			// Special case for CLI since the var_dump of a backtrace is of little use.
			$str = '';
			foreach ($trace as $i => $frame)
			{
				$line = "#$i\t";

				if ( ! isset($frame['file']))
				{
					$line .= "[internal function]";
				}
				else
				{
					$line .= $frame['file'] . ":" . $frame['line'];
				}

				$line .= "\t";

				if (isset($frame['function']))
				{
					if (isset($frame['class']))
					{
						$line .= $frame['class'] . '::';
					}

					$line .= $frame['function'] . "()";
				}

				$str .= $line . "\n";

			}

			return $str;
		}
		else
		{
			return static::dump($trace);
		}
	}