<?php $stores = ['store1', 'store2']; $items = [ 'electronics' => 'led tv', 'cosmetics' => 'eyeliner', 'fruits' => 'apple', 'vegetables' => 'cabbage', ]; var_export( array_reduce( $stores, fn($result, $s) => $result + [$s => $items + ['store' => $s]], [] ) );
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