3v4l.org

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<?php $ids = [1, 2, 2, 3]; $vals = [10, 20, 30, 50]; foreach ($ids as $index => $id) { if (!isset($result[$id])) { $result[$id] = $vals[$index]; } else { $result[$id] += $vals[$index]; } } var_export($result);
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
array ( 1 => 10, 2 => 50, 3 => 50, )
preferences:
154.71 ms | 407 KiB | 5 Q