CommandHelper main.ms

bind(player_join, null, null, @event,
    @prefix = 'PREFIX';

    @array = get_value('players.joined')
    if( is_null(@array) ) {
        @array = array();
    } else {
        array_sort(@array, 'STRING_IC');
    }

    if(array_contains(@array, player())) {

    } else {
        array_push(@array, player());
        store_value('players.joined', @array);
        runas('~console', concat(concat('/pex user ', player()), concat(' prefix ', @prefix)));
    }

)