I wrote a algorithm of arrow's movement.Just a little change in Player.php Put it in /src/ and rewrite the original one, then you can shoot arrows in your server Have fun! ps:Arrows can't hurt people now, but I'll solve this problem.
Cool! I'll do some testing, then push this to the PocketMine official tree if it works. Thanks for your contribution! Regards, William PocketMine Team Creator of the Lifeboat Server Network