Online PHP editor | refs for O81Z0

<?php $data = [ ['chart_value' => 0], ['chart_value' => 1], ['chart_value' => 2], ['chart_value' => 3], ['chart_value' => 4], ['chart_value' => 5], ['chart_value' => 6], ['chart_value' => 0], ['chart_value' => 1], ['chart_value' => 2], ['chart_value' => 3], ['chart_value' => 4], ['chart_value' => 5], ['chart_value' => 6], ['chart_value' => 0], ['chart_value' => 1], ['chart_value' => 2], ['chart_value' => 3], ['chart_value' => 4], ['chart_value' => 5], ['chart_value' => 6], ['chart_value' => 0], ['chart_value' => 1], ['chart_value' => 2], ['chart_value' => 3], ['chart_value' => 4], ['chart_value' => 5], ['chart_value' => 6], ['chart_value' => 0], ['chart_value' => 1], ['chart_value' => 2], ['chart_value' => 3], ['chart_value' => 4], ['chart_value' => 5], ['chart_value' => 6], ['chart_value' => 0], ['chart_value' => 1], ['chart_value' => 2], ['chart_value' => 3], ['chart_value' => 4], ['chart_value' => 5], ['chart_value' => 6], ['chart_value' => 0], ['chart_value' => 1], ['chart_value' => 2], ['chart_value' => 3], ['chart_value' => 4], ['chart_value' => 5], ['chart_value' => 6], ['chart_value' => 0], ['chart_value' => 1], ['chart_value' => 2], ['chart_value' => 3], ['chart_value' => 4], ['chart_value' => 5], ['chart_value' => 6], ]; $x = array_chunk($data, 7, true); foreach($x as $idx => $item) { $chart_sum = array_sum(array_column($item, 'chart_value')); }