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