laravel-5

Collections 302
12 */
keys() {#collection-method}
The keys method returns all of the collection’s keys:
1 $collection = collect([
2 'prod-100' => ['product_id' => 'prod-100', 'name' => 'Desk'],
3 'prod-200' => ['product_id' => 'prod-200', 'name' => 'Chair'],
4 ]);
5
6 $keys = $collection->keys();
7
8 $keys->all();
9
10 // ['prod-100', 'prod-200']
last() {#collection-method}
The last method returns the last element in the collection that passes a given truth test:
1 collect([1, 2, 3, 4])->last(function ($value, $key) {
2 return $value < 3;
3 });
4
5 // 2
You may also call the last method with no arguments to get the last element in the collection. If
the collection is empty, null is returned:
1 collect([1, 2, 3, 4])->last();
2
3 // 4