3v4l.org

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<?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);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
array ( 'Cars' => array ( 'Volvo' => 1, 'Mercedes' => 0, 'BMW' => 0, 'Audi' => 1, ), 'Motorcycle' => array ( 'Ducati' => 0, 'Honda' => 0, 'Suzuki' => 0, 'KTM' => 0, ), )
preferences:
140.18 ms | 407 KiB | 5 Q