[Mapserver-users] change symbol with mapscipt??

[ArminWaespy@web.de]

hello,
i tried to change  the SYMBOL with mapscript/php like 

 if ($HTTP_GET_VARS["geo"] and $HTTP_GET_VARS["relief_schummerung"])
  {
		$aLayer = $map->getlayerbyname(geo);
		$myClass = $aLayer->getClass(30);
		$myClass->set("SYMBOL", sch_gneis);									
  }

but it doesn't work.
there's an error:

Fatal error: Property 'SYMBOL' does not exist in this object.

anyone an idea to change the symbol with mapscript/php??

thanks
armin
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