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<?php $array = array_fill(0, 14, ['amount_paid' => 2050.00]); $result = []; foreach ($array as $i => $row) { $group = intdiv($i, 10); $result[$group] = ($result[$group] ?? 0) + $row['amount_paid']; } var_export($result);
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array ( 0 => 20500.0, 1 => 8200.0, )

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44.66 ms | 1105 KiB | 4 Q