[10.x] Fix for sortByDesc ignoring multiple attributes (#50431)

* Failing Test

* Fix for sortByDesc

* Update Collection.php

---------

Co-authored-by: Taylor Otwell <taylor@laravel.com>

src/Illuminate/Collections/Collection.php

@@ -1490,6 +1490,16 @@ protected function sortByMany(array $comparisons = [], int $options = SORT_REGUL
      */
     public function sortByDesc($callback, $options = SORT_REGULAR)
     {
+        if (is_array($callback) && ! is_callable($callback)) {
+            foreach ($callback as $index => $key) {
+                $comparison = Arr::wrap($key);
+
+                $comparison[1] = 'desc';
+
+                $callback[$index] = $comparison;
+            }
+        }
+
         return $this->sortBy($callback, $options, true);
     }
 

tests/Support/SupportCollectionTest.php

@@ -2047,6 +2047,21 @@ public function testSortByCallableString($collection)
         $this->assertEquals([['sort' => 1], ['sort' => 2]], array_values($data->all()));
     }
 
+    #[DataProvider('collectionClassProvider')]
+    public function testSortByCallableStringDesc($collection)
+    {
+        $data = new $collection([['id' => 1, 'name' => 'foo'], ['id' => 2, 'name' => 'bar']]);
+        $data = $data->sortByDesc(['id']);
+        $this->assertEquals([['id' => 2, 'name' => 'bar'], ['id' => 1, 'name' => 'foo']], array_values($data->all()));
+
+        $data = new $collection([['id' => 1, 'name' => 'foo'], ['id' => 2, 'name' => 'bar'], ['id' => 2, 'name' => 'baz']]);
+        $data = $data->sortByDesc(['id']);
+        $this->assertEquals([['id' => 2, 'name' => 'bar'], ['id' => 2, 'name' => 'baz'], ['id' => 1, 'name' => 'foo']], array_values($data->all()));
+
+        $data = $data->sortByDesc(['id', 'name']);
+        $this->assertEquals([['id' => 2, 'name' => 'baz'], ['id' => 2, 'name' => 'bar'], ['id' => 1, 'name' => 'foo']], array_values($data->all()));
+    }
+
     /**
      * @dataProvider collectionClassProvider
      */