worldLock <- array( 200, false ) // I don't think you'd even need 100 worlds but anyway
function onPlayerCommand( player, cmd, text )
{

    switch( cmd.tolower( ) )
    {

        case "gotoworld":

            if ( !text ) MessagePlayer( "/gotoworld [World ID]", player );
            else if ( !IsNum( text ) ) MessagePlayer( "ID must be an integer.", player );
            else if ( text.tointeger( ) > 200 || text.tointeger( ) < 0 ) MessagePlayer( "The range must be between 0-200", player );
            else if ( worldLock[ text.tointeger( ) ] ) MessagePlayer( "The world is locked.", player );
            else
            [

                player.World        =   text.tointeger( );
                Message( player.Name + " has been sent to world " + text );

            }

        break;

        case "lockworld":

            if ( !text ) MessagePlayer( "/lockworld [World ID]", player );
            else if ( !IsNum( text ) ) MessagePlayer( "ID must be an integer.", player );
            else if ( text.tointeger( ) > 200 || text.tointeger( ) < 0 ) MessagePlayer( "The range must be between 0-200", player );
            else if ( worldLock[ text.tointeger( ) ] ) MessagePlayer( "The world is already locked.", player );
            else
            {

                worldLock[ text.tointeger( ) ]      =   true;
                Message( player.Name + " has locked world " + text );

            }

        break;

        case "unlockworld":

            if ( !text ) MessagePlayer( "/unlockworld [World ID]", player );
            else if ( !IsNum( text ) ) MessagePlayer( "ID must be an integer.", player );
            else if ( text.tointeger( ) > 200 || text.tointeger( ) < 0 ) MessagePlayer( "The range must be between 0-200", player );
            else if ( !worldLock[ text.tointeger( ) ] ) MessagePlayer( "The world is not locked.", player );
            else
            {

                worldLock[ text.tointeger( ) ]      =   false;
                Message( player.Name + " has unlocked world " + text );

            }

        break;

        default:

            MessagePlayer( "Unknown command, try /gotoworld, /lockworld or /unlockworld.", player );

        break;

    }

}