TreeMap Clustering in SVG with PHP

I've written a PHP script used to display a treemaps cluster using SVG. The code was inspired from [here]. As Firefox now supports the SVG format, the drawing can be displayed in the web browser.

The PHP code is available at http://www.urbigene.com/treemapphp/


As an example, I've used data from www.postgenomic.com/ (Which journals are bloggers linking to most frequently?)

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