我在使用該函數處理數組時遇到了一些問題array_merge。這是一個例子：$first_array = [    8 => [        'name' => "Hershey's Chocolate Milk Shake",        'code' => 8 ,        'price' => 29.00,        'quantity' => 1,        'image' => "Hersheys_Chocolate_Milk_Shake.jpg",        'percentage_discount' => 0,        'offer_mrp' => 0,    ]];$second_array = [    20 => [        'name' => 'Kissan Mixed Fruit Jam 700g',        'code' => 20,        'price' => 215.00,        'quantity' => 1,        'image' => 'Kissan Mixed Fruit Jam 700g.jpg',        'percentage_discount' => 0,        'offer_mrp' => 0     ]];$first_array = array_merge($first_array, $second_array); print_r($first_array);結果是：Array (     [0] => Array (         [name] => Hershey's Chocolate Milk Shake         [code] => 8         [price] => 29.00         [quantity] => 1         [image] => Hersheys_Chocolate_Milk_Shake.jpg         [percentage_discount] => 0         [offer_mrp] => 0    )     [1] => Array (         [name] => Kissan Mixed Fruit Jam 700g         [code] => 20         [price] => 215.00         [quantity] => 1         [image] => Kissan Mixed Fruit Jam 700g.jpg         [percentage_discount] => 0 [offer_mrp] => 0     ) );但我希望它是：Array (     [8] => Array (         [name] => Hershey's Chocolate Milk Shake         [code] => 8         [price] => 29.00         [quantity] => 1         [image] => Hersheys_Chocolate_Milk_Shake.jpg         [percentage_discount] => 0         [offer_mrp] => 0    )     [20] => Array (         [name] => Kissan Mixed Fruit Jam 700g         [code] => 20         [price] => 215.00         [quantity] => 1         [image] => Kissan Mixed Fruit Jam 700g.jpg         [percentage_discount] => 0 [offer_mrp] => 0     ))