[11.x] SORT_NATURAL on Collection no longer throws warning for nulls (#52557)

* casting occasional nulls to strings

* update

* Updated test

---------

Co-authored-by: Scott Chaplinski <[email protected]>

Author: Chaplinski

src/Illuminate/Collections/Collection.php

@@ -1561,7 +1561,7 @@ protected function sortByMany(array $comparisons = [], int $options = SORT_REGUL
                         $result = match ($options) {
                             SORT_NUMERIC => intval($values[0]) <=> intval($values[1]),
                             SORT_STRING => strcmp($values[0], $values[1]),
-                            SORT_NATURAL => strnatcmp($values[0], $values[1]),
+                            SORT_NATURAL => strnatcmp((string) $values[0], (string) $values[1]),
                             SORT_LOCALE_STRING => strcoll($values[0], $values[1]),
                             default => $values[0] <=> $values[1],
                         };

tests/Support/SupportCollectionTest.php

@@ -2003,6 +2003,32 @@ public function testSortByMany($collection)
     }
 
     #[DataProvider('collectionClassProvider')]
+    /**
+     * @dataProvider collectionClassProvider
+     */
+    public function testNaturalSortByManyWithNull($collection)
+    {
+        $itemFoo = new \stdClass();
+        $itemFoo->first = 'f';
+        $itemFoo->second = null;
+        $itemBar = new \stdClass();
+        $itemBar->first = 'f';
+        $itemBar->second = 's';
+
+        $data = new $collection([$itemFoo, $itemBar]);
+        $data = $data->sortBy([
+            ['first', 'desc'],
+            ['second', 'desc'],
+        ], SORT_NATURAL);
+
+        $this->assertEquals($itemBar, $data->first());
+        $this->assertEquals($itemFoo, $data->skip(1)->first());
+    }
+
+    #[DataProvider('collectionClassProvider')]
+    /**
+     * @dataProvider collectionClassProvider
+     */
     public function testSortKeys($collection)
     {
         $data = new $collection(['b' => 'dayle', 'a' => 'taylor']);