Introduction #

DifferenceColumn is a process to add a differential column based on an existed column.

Example #

class MyReport extends \koolreport\KoolReport
    public function setup()
        ->pipe(new \koolreport\processes\DifferenceColumn(array(
            "diff" => "dollar_sales",

Code explanation:

In the above example, we create a column called "diff" value of which is difference between the "dollar_sales" column value of the current data row and the previous one.

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