Check fly enable

PlayerMoveEvent

 

And how can I check the packet? If the player kklicked jump?

 

PlayerJumpEvent

 

There is no event with that name. Lol

 

Oh, sorry so

PHP:

  if($event->getTo()->getY() > $event->getFrom()->getY() && $block->getId() == 0) {

 

Player can not jump in air

 

To be real honest there is no proper way of detecting if someone is trying to fly in survival mode. None of the work arounds are consistend and reliable, you could check if a player hasn't been on the ground for so many seconds and kick him if that's the case, but it might as well be fall damage or huge lag.

 

This code checks whether a player is double-tapping the jump button and it enables flight (this does not trigger when just double tapping without hacking.). Didn't test it, but should work.

PHP:

public function onPacketReceive(DataPacketReceiveEvent $event){
    $player = $event->getPlayer();
    
    if($event->getPacket() instanceof AdventureSettingsPacket) {
        // Packet buffers
        // 37e60400 - Enable fly
        // 376600 - disable fly
        if(!$this->allowFlight && ($packet->flags >> 9) & 0x01 === 1) || (!$this->isSpectator() && ($packet->flags >> 7) & 0x01 === 1){
            // Fly button used
        }
    }
}