is there any possibility to cluster markers until a predefined zoomlevel (e.g. from 0 to 7) and from that of to display custom icons which are not clustered. in addition: if a marker is not within a cluster, there has to appear the custom icon, too. furthermore: if possible the color/icon of the cluster should be selected by a variable committed by a php script
You can try a marker cluster in php:http://www.appelsiini.net/2008/introduction-to-marker-clustering-with-google-maps.