Online PHP editor | refs for e6o1Q

<?php $sampleArray = [ ["id" => 0.1, "marks" => 2], ["id" => 0.2, "marks" => 4], ["id" => 0.3, "marks" => 1], ["id" => 1.1, "marks" => 6], ["id" => 1.2, "marks" => 0], ["id" => 1.3, "marks" => 8], ["id" => 2.1, "marks" => 7], ["id" => 2.2, "marks" => 12], ]; $result = []; foreach ($sampleArray as $row) { $result[$row['id']] = ($result[$row['id']] ?? 0) + $row['marks']; } var_export($result);