Effect forever

is there a way where I can make it so they have like jump boost 2 forever on the whole server?

PHP:

public function onJoin(PlayerJoinEvent $pje) {
        $player = $pje->getPlayer();
        $id = 1;
        $amplifier = 0;
        $visibility = false;
        $duration = 50000000000000000;
        $effect = Effect::getEffect($id);
      
        $effect->setVisible($visibility);
        $effect->setDuration($duration);
        $effect->setAmplifier($amplifier);
        $player->addEffect($effect);
    }

It goes away after death but if you find a way to give it to the player after the PlayerDeathEvent then it should work fine.

Ok so I still don't know PhP but how will I put this on my server? Make a zip file... Then what do I put inside the zip?

That's not how you do it. You need to learn php & Pocketmine Api so you can make plugins.
Try using GetInEffects

Ok thx about to start learning PhP

25 Years later "Dude are done learining PHP"

Lol might be true xD

LoL XD