# merge方法 将给定数组或集合合并到原集合。 如果给定项目中的字符串键与原集合中的字符串键匹配，给定的项目的值将会覆盖原集合中的值。 ``` $collection = collect(['product_id' => 1, 'price' => 100]); $merged = $collection->merge(['price' => 200, 'discount' => false]); $merged->all(); // ['product_id' => 1, 'price' => 200, 'discount' => false] ``` 如果给定的项目的键是数字，这些值将被追加到集合的末尾： ``` $collection = collect(['Desk', 'Chair']); $merged = $collection->merge(['Bookcase', 'Door']); $merged->all(); // ['Desk', 'Chair', 'Bookcase', 'Door'] ```