function CopyLayerFromSession($map, $resourceService, $sessionLayerId)
{
$destinationLayerId = ToggleRepository($sessionLayerId);
//copy content from session layer
$contentReader = $resourceService->GetResourceContent($sessionLayerId);
$layerContent = $contentReader->ToString();
$byteSource = new MgByteSource($layerContent, strlen($layerContent));
$resourceService->SetResource($destinationLayerId, $byteSource->GetReader(), null);
//instantiate the new layer from its MgResourceIdentifier
$layer = new MgLayer($destinationLayerId, $resourceService);
//set the feature source this layer references -- must be in the session
$sessionLayer = new MgLayer($sessionLayerId, $resourceService);
$destinationFeatureSourceId = ToggleRepository($sessionLayer->GetFeatureSourceId());
$layer->SetFeatureSourceId($destinationFeatureSourceId);
$layer->ForceRefresh();
//remove the session layer from the session map and replace it with the
//library copy
ReplaceLayer($map, $sessionLayer, $layer);
//save the session map
$map->Save($resourceService);
return $layer;
}
