<?php
    session_start();
    require_once '<your path>/common.php';
    try{
        $args = ($_SERVER['REQUEST_METHOD'] == 'POST')? $_POST : $_GET;
        $sessionId = $args['SESSION'];
        $mapName = $args['MAPNAME'];

        MgInitializeWebTier ($webconfigFilePath);
        $userInfo = new MgUserInformation($sessionId);
        $siteConnection = new MgSiteConnection();
        $siteConnection->Open($userInfo);

        try{
            $resourceService = $siteConnection->CreateService(MgServiceType::ResourceService);
            $featureService = $siteConnection->CreateService(MgServiceType::FeatureService);

            $map = new MgMap();
            $map->Open($resourceService, $mapName);

            $selection = new MgSelection($map, $_POST['SELECTION']);
            $layers = $selection->GetLayers();
            if($layers->GetCount() > 0){
                $layer = $layers->GetItem(0);
                if($layer){
                    $layerClassName = $layer->GetFeatureClassName();
                    $selectionString = $selection->GenerateFilter($layer,$layerClassName);
                    $layerFeatureId = $layer->GetFeatureSourceId();

                    // Collect objects to be passed to SelectFeatures function
                    $layerFeatureResource = new MgResourceIdentifier($layerFeatureId);
                    $queryOptions = new MgFeatureQueryOptions();
                    $queryOptions->AddFeatureProperty('Field 1');
                    $queryOptions->AddFeatureProperty('Field 2');
                    $queryOptions->SetFilter($selectionString);
                    try{
                        // Create the reader
                        $featureReader = $featureService->SelectFeatures($layerFeatureResource,$layerClassName, $queryOptions);
                        $featureReader->ReadNext();
                        $field1= $featureReader->GetString('Field 1');
                        $field2 = $featureReader->GetString('Field 2');
                        echo $field1 .' - '.$field2;
                    }
                    catch(MgApplicationException $ex){
                        echo '<b>Exception: </b>'.$ex->GetDetails();
                    }
                }
            }
        }
        catch (MgException $e){
            echo $e->GetExceptionMessage();
            echo $e->GetDetails();
        }
    }
    catch (MgException $e){
        echo $e->GetExceptionMessage();
        echo $e->GetDetails();
    }
?>

<input type="hidden" name="SELECTION" id="hidSelectionXML" />

document.getElementById('hidSelectionXML').value = parent.parent.mapFrame.GetSelectionXML();