Highcharts graph not shown in Yii2 - highcharts

Question

I am getting array data from a function ReportsController::getStudentYearwiseAvgHeightsProvince() in the below format:
Array ( [0] => Array ( [name] => Baluchistan [data] => Array ( [0] => 0 [1] => 0 [2] => 0 [3] => 0 [4] => 0 [5] => 0 [6] => 0 ) ) [1] => Array ( [name] => KPK [data] => Array ( [0] => 56 [1] => 58 [2] => 58 [3] => 0 [4] => 0 [5] => 0 [6] => 60 ) ) [2] => Array ( [name] => Punjab [data] => Array ( [0] => 0 [1] => 0 [2] => 0 [3] => 78 [4] => 90 [5] => 90 [6] => 0 ) ) [3] => Array ( [name] => Sindh [data] => Array ( [0] => 0 [1] => 0 [2] => 0 [3] => 0 [4] => 0 [5] => 0 [6] => 0 ) ) )
ReportsController::getStudentYearwiseAvgHeightsProvince() function is:
public function getStudentYearwiseAvgHeightsProvince() {
$result = Yii::$app->db->createCommand ( '
SELECT temp.name AS name,
GROUP_CONCAT(IFNULL(temp.height,0) order by year) AS data
FROM ( SELECT years.year AS year, p.name AS NAME, FLOOR(AVG(sd.height)) AS height
FROM (
SELECT DISTINCT year FROM student_detail ORDER BY year
) years
cross join province p
left join student_detail sd on years.year = sd.year and sd.province_id = p.id
GROUP BY years.year, p.name
ORDER BY years.year )
AS temp
GROUP BY name; ' )->queryAll ();
$i = 0;
foreach ($result as $innerArray) {
$result[$i]['data'] = explode(",", $result[$i]['data']);
//$result[$i]['name'] = $innerArray['name'];
$i++;
}
//$result = array_map(function($var){ return (int) $var['data']; }, $result); // extraction from 2 level associative arry to 1-d associative array
print_r ( $result );
return $result;
}
and I am setting highcharts component as follows:
echo Highcharts::widget([
'scripts' => [
'modules/exporting',
'themes/grid-light',
],
'options' => [
'title' => ['text' => 'Student Province-wise Yearly Avg Heights'],
'plotOptions' => [
'column' => [
'depth' => 25
]
],
'xAxis' => [
'categories' => ReportsController::getDistinctCols("student_detail", "year")
],
'yAxis' => [
'min' => 0,
'title' => ['text' => 'Avg Height']
],
'series' =>
ReportsController::getStudentYearwiseAvgHeightsProvince()
]
]);
No graph is generated :(

Answer 1

I fixed the graph not showing issue by just converting the STRING ARRAY to INTEGER ARRAY which is returned by EXPLODE in my function getStudentYearwiseAvgHeightsProvince()
by editing the code inside FOREACH LOOP as:
foreach ($result as $innerArray) {
$result[$i]['data'] = explode(",", $result[$i]['data']);
$temp = array();
foreach ($result[$i]['data'] AS $index => $value)
$temp[$index] = (int)$value;
$result[$i]['data'] = $temp;
$i++;
}