Laravel - Collections - Method Flatmap

The flatMap method iterates through the collection and passes each value to the given closure. The closure is free to modify the item and return it, thus forming a new collection of modified items. Then, the array is flattened by one level:

    $collection = collect([
        ['name' => 'Sally'],
        ['school' => 'Arkansas'],
        ['age' => 28]
    $flattened = $collection->flatMap(function ($values) {
        return array_map('strtoupper', $values);
    // ['name' => 'SALLY', 'school' => 'ARKANSAS', 'age' => '28'];