Mine

	/**
	 * Return uptime as a string
	 *
	 * Example: 60 days, 8 hours, 2 minutes, 7 seconds
	 *
	 * @return string
	 */
	public static function getAsString()
	{
		$uptime = self::get();
		$uptime = array( // I'm careful hehe, lets make sure the order is right
			'days' => $uptime['days'],
			'hours' => $uptime['hours'],
			'minutes' => $uptime['minutes'],
			'seconds' => $uptime['seconds']
		);

		$uptimeString = array();
		foreach ($uptime as $key => $time) {
			if (!$key == 'seconds' & $time < 1) { // some how less than zero :]
				continue;
			}

			$uptimeString[] = $time . ' ' . (($time == 1) ? substr($key, 0, -1) : $key);
		}