Description: ------------ The cluster attributes need to be separated by semicolon (;) in DOT format but they are wrongly parsed and are separated by comma (,). The fix is to change line 478 in GraphViz.php: Current: $parsedGraph .= implode(',', $attributeList) . ";\n"; Change to: $parsedGraph .= implode(';', $attributeList) . ";\n"; Test script: --------------- <?php include "Image/GraphViz.php"; $graph = new Image_GraphViz(); $graph->setDirected(true); $graph->addNode('Node1',array('label'=>'Node1'),'cluster_1'); $graph->addNode('Node2',array('label'=>'Node2'),'cluster_1'); $graph->addNode('Node3',array('label'=>'Node3'),'cluster_2'); $graph->addNode('Node4',array('label'=>'Node4'),'cluster_2'); $graph->addCluster('cluster_1','Cluster - 1',array('bgcolor'=>'grey90','label'=>'cluster_1')); $graph->addCluster('cluster_2','Cluster - 2',array('bgcolor'=>'grey90','label'=>'cluster_2')); print $graph->parse(); ?> Expected result: ---------------- digraph G { subgraph "cluster_cluster_1" { label="Cluster - 1"; bgcolor="grey90";label="cluster_1"; "Node1" [ label="Node1" ]; "Node2" [ label="Node2" ]; } subgraph "cluster_cluster_2" { label="Cluster - 2"; bgcolor="grey90";label="cluster_2"; "Node3" [ label="Node3" ]; "Node4" [ label="Node4" ]; } } Actual result: -------------- digraph G { subgraph "cluster_cluster_1" { label="Cluster - 1"; bgcolor="grey90",label="cluster_1"; "Node1" [ label="Node1" ]; "Node2" [ label="Node2" ]; } subgraph "cluster_cluster_2" { label="Cluster - 2"; bgcolor="grey90",label="cluster_2"; "Node3" [ label="Node3" ]; "Node4" [ label="Node4" ]; } }

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