The Google Chart API lets you dynamically generate charts with a URL string and embed these charts on a web page, or download the image for local or offline use. The Google Chart Tools enable adding live charts to any web page. They provide advantages such as a rich gallery of visualizations provided as image charts and interactive charts and they can read live data from a variety of data sources.
Users embed the data and formatting parameters in an HTTP request, and Google returns a PNG image of the chart. Many types of chart are supported, and by making the request into an image tag the chart can be included in a web page.
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from the site:PHP Object wrapper for the Google Chart API. A simple PHP Object wrapper for the Google Chart API. Should help anyone who needs to automate the building of the Google Chart url. Supports all types of charts.