What are you using this for? If it's returning true/false, then I assume it's going into some kind of script or program? If so, there may be a better way of doing this than using placeholders
The placeholder will only exist when the player is online - it'll be registered when they join the server, and unregistered when they leave to prevent potentially 1000's of named placeholders taking up memory. Does that work for you?
If you query a player whose not online or with an unknown name, the placeholder returned will be %bskyblock_onisland_<player>% - okay?
As players can have more than one island in the same game mode, it'll reply true if the player is on any of those - okay?
of course
I want to create a ban menu that allows players to click on the player's head to prohibit them from entering the island. I just need a way to determine if a player is on my island
Description
If this player is on my island, return true If not present, return false
Placeholder:
%bskyblock_onisland_<player>%