Giving player Effect with amplifier and duration

hey how do I give $killer effect 10 for 2 seconds with amplifier 50
I did this but I know its wrong XD

PHP:

$killer->addEffect(10)->setAmplifier(50)->setDuration(2);

 

See how PocketMine does it.
https://github.com/pmmp/PocketMine-MP/blob/master/src/pocketmine/item/GoldenApple.php

https://github.com/pmmp/PocketMine-MP/blob/master/src/pocketmine/item/Food.php

 

PHP:

$time = 2;
$ticks = 20 * $time;
$visibility = false; // Set to true if you need the particles to be visible.
$amplifier = 50; // Effect Amplifier.
$id = 10; // Effect ID.
$effect = Effect::getEffect($id)->setAmplifier($amplifier)->setDuration($ticks)->setVisible($visibility);

$killer->addEffect($effect);


Or, ya know, you can take the easy road and go like

PHP:

$killer->addEffect(Effect::getEffect(10)->setAmplifier(50)->setDuration(20*2)->setVisible(false));


 

Wrong placement of parentheses, it should be:

PHP:

$killer->addEffect(Effect::getEffect(10)->setAmplifier(50)->setDuration(20*2)->setVisible(false));


 

Aye thanks <3
I edited it