Creating charts via Google Charts API is already simple.
GoogChart is a PHP class which makes it easier & more flexible.
Here is an example:
After creating an array ($data in the example), this simple code is enough for generating a pie chart.
$chart = new googChart();
‘type’ => ‘pie’,
‘data’ => $data,
‘size’ => array( 300, 200 )
Although GoogChart supports a serious amount of attributes & types for Google Charts API, currently, not all of them.
There are also other similar PHP classes which you may want to check like: