Laravel 8 concat() {#collection-method}

concat 方法在集合的末端附加指定的 数组 或集合值：

$collection = collect(['John Doe']);

$concatenated = $collection->concat(['Jane Doe'])->concat(['name' => 'Johnny Doe']);

$concatenated->all();

// ['John Doe', 'Jane Doe', 'Johnny Doe']