Online PHP editor | refs for S09e5

<?php $entities = [ 'deliveredAt' => null, 'issuedAt' => null, 'totals' => [ 'due' => null, 'gross' => null, 'net' => null, 'tax' => [ 'amount' => null, 'net' => null, 'rate' => null, ], ] ]; $realData = [ "issuedAt" => "2020-08-20", "totals" => [ "tax" => [ 'net' => 42, ] ] ]; print_r(array_replace_recursive($entities, $realData));