Zoom to Parcel

[Kevin Grootendorst]

Below is the code I'm using to implement a 'zoom to parcel' feature in my
map, where the user inputs a parcel number, and the map will zoom to the
parcel.
For some reason, there is a problem with the 'GetShape' statement, as this
is where the mapserver halts.
Does anyone know what's wrong with the 'GetShape' statement?

MS 4.2
PHP 4.3.4
Win 2000

if (isset( $http_form_vars["parcelnum"]) && ($http_form_vars["parcelnum"]
> "0" ))
{
 echo "zoom to parcel";
 // the Parcel number to query for
 $szParcelNumber = $http_form_vars["parcelnum"];

 // the current extents will be the default if we fail.
 $oExtents = $oMapSession->oMap->extent;
 $oldExtents=$oExtents;

 //get layer name
 $oParcelLayer = $oMapSession->oMap->getLayerByName( "ParcelData" );

 //if (isset($oReachLayer))
  //echo "reach is set";
  //print_r ($oReachLayer);

 $oParcelLayer->queryByAttributes("PIN", $szParcelNumber,
MS_SINGLE );

 $results = $oParcelLayer->getNumResults();
 //echo "$results";
 //now check to see if there are any results
 if ($oParcelLayer->getNumResults() > 0 )
 {
  echo " results2";
  //at least one result, assume only one for this example
  $oResult = $oParcelLayer->getResult( 0 );

  //oResult is a resultCacheMemberObj
  $oParcelLayer->open($oMapSession->oMap->shapepath);
  echo " results3";  //this is echoed
//**problem with next line
  $oShape = $oParcelLayer->GetShape($oResult-
>tileindex,$oResult->shapeindex); //**** problem?
  echo " results4";  //this is not echoed
  $oExtents = $oShape->bounds;
  echo " results5";
  $oShape->free();

  //at this point we might add a buffer to the extents
  $nXBuffer = ( $oExtents->maxx - $oExtents->minx )*0.05;
  $nYBuffer = ( $oExtents->maxy - $oExtents->miny )*0.05;
  $nMinX = $oExtents->minx - $nXBuffer;
  $nMaxX = $oExtents->maxx + $nXBuffer;
  $nMinY = $oExtents->miny - $nYBuffer;
  $nMaxY = $oExtents->maxy + $nYBuffer;
  $oExtents->setextent( $nMinX, $nMinY, $nMaxX, $nMaxY );
 echo "$nMinX";
 echo "$nMaxX";
 echo "$nMinY";
 echo "$nMaxY";
 }
 else{
  echo " no results";}



 $width=$oMapSession->oMap->width;
 $height=$oMapSession->oMap->height;

 $px1=$width/($oldExtents->maxx-$oldExtents->minx)*($oExtents->minx-
$oldExtents->minx);
 $px2=$width/($oldExtents->maxx-$oldExtents->minx)*($oExtents->maxx-
$oldExtents->minx);
 $py1=$height/($oldExtents->maxy-$oldExtents->miny)*($oldExtents-
>maxy-$oExtents->maxy);
 $py2=$height/($oldExtents->maxy-$oldExtents->miny)*($oldExtents-
>maxy-$oExtents->miny);

 $oMapNavigator->zoomRectangle($px1, $py2, $px2, $py1);
}
else
{
echo "parcel is null or negative";
}