If a player has no effect, and if the player is faster than normal, how can I kick that player off my server?
PM's anti-speed-hack is broken You might just want to check the distance a player moved in a tick and if it's too high, revert the movement or kick him.
use it like this ob PlayerMoveEvent. https://github.com/TesseractTeam/Tesseract/blob/master/src/pocketmine/Player.php#L1574
You really don't even need too much PHP knowledge for tasks, if you know the basics. You can check out this thread by @Jack Noordhuis even though it mostly pertains to timers, or you can check out http://learn-mc.ga/MCPE/#Vol4 for a quick Task tutorial. And of course, check out src/pocketmine/scheduler/PluginTask(I think this is the right file path...).