## sortByDesc方法 與 sortBy 方法一樣，但是會以相反的順序來對集合進行排序 與[sortBy](http://www.hmoore.net/collections/sortBy.md)方法一樣，但是會以相反的順序來對集合進行排序。 ~~~ $collection = collect([ ['name' => 'Desk', 'colors' => ['Black', 'Mahogany']], ['name' => 'Chair', 'colors' => ['Black']], ['name' => 'Bookcase', 'colors' => ['Red', 'Beige', 'Brown']], ]); $sorted = $collection->sortBy(function ($product, $key) { return count($product['colors']); }); $sorted->values()->all(); /* [ ['name' => 'Bookcase','colors' => ['Red', 'Beige', 'Brown']], ['name' => 'Desk', 'colors' => ['Black', 'Mahogany']], ['name' => 'Chair', 'colors' => ['Black']] ]; */ ~~~