<?php $full = [ 'Cars' => [ 'Volvo' => 0, 'Mercedes' => 0, 'BMW' => 0, 'Audi' => 0 ], 'Motorcycle' => [ 'Ducati' => 0, 'Honda' => 0, 'Suzuki' => 0, 'KTM' => 0 ] ]; $semi = [ 'Volvo' => 1, 'Audi' => 1 ]; foreach ($full as &$manufacturers) { foreach ($manufacturers as $m => &$count) { $count += $semi[$m] ?? 0; } } var_export($full);
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