command /pvp:
    description: Toggles PvP.
    usage: /pvp
    permission: skript.pvp
    permission message: §4Sorry, you can't do this.
    trigger:
        if PvP is disabled:
            enable PvP in all worlds
            message "§cPvP has been enabled."
            stop
        if PvP is enabled:
            disable PvP in all worlds
            message "§cPvP has been disabled."
            stop