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']