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<?php
	$uptime_array = explode(" ", exec("cat /proc/uptime"));
	$seconds = round($uptime_array[0], 0);
	$minutes = $seconds / 60;
	$hours = $minutes / 60;
	$days = floor($hours / 24);
	$hours = floor($hours - ($days * 24));
	$minutes = floor($minutes - ($days * 24 * 60) - ($hours * 60));
	$seconds = floor($seconds - ($days * 24 * 60 * 60) - ($hours * 60 * 60) - ($minutes * 60));
	$uptime_array = array($days, $hours, $minutes, $seconds);
	
	if ($uptime_array[0] == 0) {
		if ($uptime_array[1] == 0) {
			if ($uptime_array[2] == 0) {
				print("Uptime: " . $uptime_array[3] . " Sekunden");
			}
			
			else {
				print("Uptime: " . $uptime_array[2] . " Minuten");
			}
		}

		else {
			print("Uptime: " . $uptime_array[1] . " Stunden");
		}
	}

	else {
		print("Uptime: " . $uptime_array[0] . " Tage");
	}
?>

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uptime

1:

PRINT exec("cmd /c uptime");