PHP array for google chart; loop thru array and group by 2

Question

(In between Christmas meals) I am again stuck with the loop through array and group by logic. here is the array I am given

$aTest = Array
(
    Array
        (
            'date' => 2017-05-04,
            'period' => 'period2',
            'category' => 'Indoor room',
            'score' => 1
        ),

    Array
        (
            'date' => 2017-05-04,
            'period' => 'period5',
            'category' => 'Indoor room',
            'score' => 1
        ),

    Array
        (
            'date' => 2017-05-04,
            'period' => 'period2',
            'category' => 'Indoor room',
            'score' => 2
        ),

    Array
        (
            'date' => 2017-05-04,
            'period' => 'period4',
            'category' => 'Indoor room',
            'score' => 1
        ),

     Array
        (
            'date' => 2017-05-03,
            'period' => 'period5',
            'category' => 'Gym Class',
            'score' => 1
        ),

    Array
        (
            'date' => 2017-05-03,
            'period' => 'period1',
            'category' => 'Gym Class',
            'score' => 1
        ),

     Array
        (
            'date' => 2017-05-03,
            'period' => 'period4',
            'category' => 'Indoor room',
            'score' => 1
        )
        );

This time I like group by category and sum the score group by period. Y-axis will be the category and X-axis will be the period. In the end I need this for a google chart

/*period, total indoor, total gym, 'total indoor', 'total gym'*/
array(
['Period1', 0,1,'0','1'],
['Period2', 3,0,'3','0'],
['Period3', 0, 0,'0','0'],
['Period4', 4,0,'4','0'],
['Period5', 1,1,'1','1']
 )

I have this php code:

    foreach ($aTest as $value) {
            //echo $value['period'].' - '.$value['score'].'<br/>';

            if (empty($output[$value]['period']))
                $output[$value]['period'] = ['Period1' => 0, 'Period2' => 0, 'Period3' =>0, 'Period4' => 0, 'Period5' => 0];

   if(empty($output[$value]['category']))
        $output[$value['catgeory']] = ['Gym Class' => 0, 'Indoor room' =>0];

            $output[$value['category']] += $value['score'];
        }

        ksort($output);

but this only totals the score by Category and not by period. I think I need to loop through the periods as well, but how?

Answer 1

• You have a wrong logic here.

 if (empty($output[$value]['period'])) $output[$value]['period'] = ['Period1' => 0, 'Period2' => 0, 'Period3' =>0, 'Period4' => 0, 'Period5' => 0];

that $value is an array and you try to check $output[$value]

• I saw that you don't have any line sum periods Value.

• I have a solution for your data. What is my code do??

• Sum score of the period by the category

• For each merge period and category score to an array using arraySort category to set position of these category scores values

$temp = []; $output = []; foreach($aTest as $value){ $period = $value['period']; $category = $value['category']; // Create default values if (empty($temp[$period])){ $temp[$period] = []; } if(empty($temp[$period][$category])){ $temp[$period][$category] = 0; } //Sum score $temp[$period][$category] += $value['score']; } //After Forech we have an array with ['period name' => ['category name' => score]]; //Sort values of the category change it if you want, you can add more option such as (item type for add '' to values) $arraySort = [ "Indoor room", //total indoor, "Gym Class", // total gym, "Indoor room", //'total indoor', "Gym Class" //'total gym' ]; foreach($temp as $period => $catsScore){ $periodItem = [$period]; foreach($arraySort as $cat){ $periodItem[] = $catsScore; } $output[] = $periodItem; }