Class Names not saved?

[Lowell Filak]

The following message was sent by Ben Loh <benpub at INQUIRIUM.NET> on Fri,
2 Sep 2005 00:43:45 -0500.

> Hi,
> 
> I'm putting together a historical map application for high 
> school/college level students and am running into some problems with 
> setting class names.
> 
> Perhaps I'm missing something obvious, but here's what's happening: 
> I want to dynamically create classes for a given map (In the full 
> app, I create classes, for the test app, I'm just changing an 
> existing class).  So, I read in the map, get the layer, and set the 
> class name to a new name.  Everything looks fine until I try to get 
> the class name from the layer again: the class name reverts to the 
> default name defined in the .map file!  Is this some kind of 
> referencing problem that I'm overlooking?  Any help would be much 
> appreciated.
> 
> Thanks!
> 
> Ben
> 
> 
> Here's a snippet of my map file:
> ============================================================
> LAYER
> 	NAME	"PersonSqK"
> 	DATA	states1790
> 	STATUS	ON
> 	TYPE	POLYGON
> 
> 	CLASS
> 		NAME "Orig Class Name"
> 		EXPRESSION ([PERSONSSQK] <= 305)
> 		STYLE
> 			COLOR			255 255 255
> 			OUTLINECOLOR		153 153 153
> 		END #STYLE
> 	END #CLASS
> 
> END #LAYER
> 
> 
> 
> And here's some test code to generate the error:
> ============================================================
> <?php
> dl('php_mapscript.so');
> 
> function dbgout( $text ) { echo $text.'<br>'; }
> 
> $map = ms_newMapObj( 'classtest.map' );
> 
> $allLayers  = $map->getAllLayerNames();
> foreach($allLayers as $a) {
>      $theLayer =  $map->getLayerByName($a);
> 
>      $baseClass  = $theLayer->getClass( 0 );
>      dbgout( 'baseClass default name = '.$baseClass->name);
>      // This displays:  "Orig Class Name"
> 
>      // Try setting the name to something new
>      $baseClass->name = 'Replaced Name';
>      dbgout( 'baseClass changed name = '.$baseClass->name);
>      // This displays:  "Replaced Name", so far everything is fine.
> 
> }
> 
> foreach($allLayers as $a) {
>      $theLayer =  $map->getLayerByName($a);
> 
>      $baseClass  = $theLayer->getClass( 0 );
>      dbgout( 'baseClass reread name = '.$baseClass->name);
>      // This displays:  "Orig Class Name"!!!!  Where did the replaced
name go?
> }
> 
> ?>

Ben,

I'm not sure where in your code you change $a to 'Replaced Name' before
running the 2nd $map->getLayerByName($a)?
If $a is not changed, aren't you asking for $map->getLayerByName("Orig
Class Name")?

Lowell