<?php $a = [ ['ID' => 1, 'Count' => 2], ]; $b = [ ['ID' => 1, 'Count' => 4], ['ID' => 2, 'Count' => 3] ]; var_export( array_values( array_reduce( array_merge($a, $b), function ($result, $row) { if (!isset($result[$row['ID']])) { $result[$row['ID']] = $row; } else { $result[$row['ID']]['Count'] += $row['Count']; } return $result; }, [] ) ) );
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