<?php $a1 = [ ['id' => 5, 'cnt' => 14], ['id' => 8, 'cnt' => 2], ]; $a2 = [ ['id' => 8, 'binding' => 'hardcover'], ['id' => 5, 'binding' => 'softcover'], ]; $result = []; foreach (array_merge($a1, $a2) as $row) { $result[$row['id']] = ($result[$row['id']] ?? []) + $row; } var_export(array_values($result));
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