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https://web.archive.org/web/20131229054653/http://sandropaganotti.com/generate-an-isochrone-map-using-google-maps-api/
looks like currently just a php error. unfortunately the map doesn't work because the google maps url it links to has not been archived...bet if you did that it would work.

You can do it in CartoDB and Odyssey.js. CartoDB is a dynamic data mapping tool, and Odyssey.js is just the open source library to create stories (and can use layers from CartoDB)

http://cartodb.com http://cartodb.github.io/odyssey.js/