$p = all players in world PHP: $this->getServer()->getDefaultLevel()->addParticle(new FloatingTextParticle(new Vector3(128, 5 + 1.50, 128), "", "text3"), [$e->getPlayer()]);
This question has been asked so many times and hence is moved to Facepalm section. http://forums.pocketmine.net/threads/remove-floating-text-on-specified-coordinates.15245/