laravel-5

Collections 298
5 // default-value
groupBy() {#collection-method}
The groupBy method groups the collection’s items by a given key:
1 $collection = collect([
2 ['account_id' => 'account-x10', 'product' => 'Chair'],
3 ['account_id' => 'account-x10', 'product' => 'Bookcase'],
4 ['account_id' => 'account-x11', 'product' => 'Desk'],
5 ]);
6
7 $grouped = $collection->groupBy('account_id');
8
9 $grouped->toArray();
10
11 /*
12 [
13 'account-x10' => [
14 ['account_id' => 'account-x10', 'product' => 'Chair'],
15 ['account_id' => 'account-x10', 'product' => 'Bookcase'],
16 ],
17 'account-x11' => [
18 ['account_id' => 'account-x11', 'product' => 'Desk'],
19 ],
20 ]
21 */
In addition to passing a string key, you may also pass a callback. The callback should return the
value you wish to key the group by: