pChart is a PHP library for creating graphs, histograms and charts. Unlike most similar libraries, pChart is free (distributed under the GPL license). Of the free main rival -
Google Chart API .
In addition to the class that renders images, there are classes for preparing data for graphing, as well as a built-in caching mechanism.
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Library operation scheme:
And now a couple of examples of work:
1.
Demo plotting charts and histograms
Example:
Source
2.
Demo of pie charts
Example:
Source