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<?php $poorly_merged = [ (object)["id" => "5", "unit" => 1], (object)["id" => "3", "text" => "three"], (object)["id" => "1", "text" => "one"], (object)["id" => "2", "text" => "two"], (object)["id" => "4", "text" => "four"], (object)["id" => "5", "text" => "five"], (object)["id" => "3", "unit" => 0], (object)["id" => "1", "unit" => "0"], (object)["id" => "2", "unit" => 0], (object)["id" => "4", "unit" => "0"] ]; $output = []; foreach ($poorly_merged as $object) { if (!isset($output[$object->id])) { $output[$object->id] = $object; } else { foreach ($object as $property => $value) { $output[$object->id]->{$property} = $value; } } } ksort($output); // optionally order by ids var_export(array_values($output));

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