laravel-5

Collections 300
1 $collection = collect([
2 ['account_id' => 1, 'product' => 'Desk'],
3 ['account_id' => 2, 'product' => 'Chair'],
4 ]);
5
6 $collection->implode('product', ', ');
7
8 // Desk, Chair
If the collection contains simple strings or numeric values, simply pass the “glue” as the only
argument to the method:
1 collect([1, 2, 3, 4, 5])->implode('-');
2
3 // '1-2-3-4-5'
intersect() {#collection-method}
The intersect method removes any values that are not present in the given array or collection:
1 $collection = collect(['Desk', 'Sofa', 'Chair']);
2
3 $intersect = $collection->intersect(['Desk', 'Chair', 'Bookcase']);
4
5 $intersect->all();
6
7 // [0 => 'Desk', 2 => 'Chair']
As you can see, the resulting collection will preserve the original collection’s keys.
isEmpty() {#collection-method}
The isEmpty method returns true if the collection is empty; otherwise, false is returned: