Counter for each?

How am I doing a counter for each player (I use $this->getServer()->getLevelByName("level")->getPlayers(), than i do foreach(){) but how I get everyone by himself, because i want tp do a kill counter but foreach is giving everyone a point and not a specified one so how do I specify a player?

What exactly do you want to do? Please be more specific.

I want to do a minigame, which counts the killamount for each player

Save the kills in a config and +1 them when the player kills someone, you don't need anything like foreach..