I am going to create a ods/xls file which saves different arrays which look like $arr[$row][$cell]=$value;
This must be inserted within the new ods/xls file. In addition to that, after each data table there must be a chart. Ods/Xls can show bar/line/time/pie charts etc. as it is supported by openoffice/excel.
In the attachment, you can find an overview of the charts (types) and sample data that we use in our web app. For this web app the ods/xls export must be developed.
My Max Budget is $70.