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<?php $products = [ [ 'id' => 21, 'name' => 'Floral Dress', 'params' => [ 'size' => 14, 'price' => 23.99, 'department' => 'Dresses' ] ], [ 'id' => 413, 'name' => 'Maxi Skirt', 'params' => [ 'size' => 10, 'price' => 12.99, 'department' => 'Skirts' ] ], [ 'id' => 78, 'name' => 'A Line Prom Dress', 'params' => [ 'size' => 10, 'price' => 79.99, 'department' => 'Dresses' ] ], [ 'id' => 212, 'name' => 'Nude Block High Heels', 'params' => [ 'size' => 6, 'price' => 20.99, 'department' => 'Shoes' ] ], [ 'id' => 54, 'name' => 'Denim Trim Dress', 'params' => [ 'size' => 8, 'price' => 52.99, 'department' => 'Dresses' ] ], ]; array_walk($products, function($product) { [$product['params']['department'] => $product]; }); print_r($products);
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