<?php $array1 = [1 , 1 , 1 , 2 , 2 , 3]; $array2 = [2 , 4 , 5 , 2 , 1 , 5]; $result = []; foreach ($array1 as $index => $id) { $result[$id] = ($result[$id] ?? 0) + $array2[$index]; } var_export($result);
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