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<?php $ids = [1, 2, 2, 3]; $vals = [10, 20, 30, 50]; foreach ($ids as $index => $id) { $result[$id] = ($result[$id] ?? 0) + $vals[$index]; } var_export($result);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
array ( 1 => 10, 2 => 50, 3 => 50, )
preferences:
82.24 ms | 402 KiB | 62 Q