[5.6] Add sortKeys and sortKeysDesc methods to Collection.

src/Illuminate/Support/Collection.php

@@ -1475,6 +1475,33 @@ public function sortByDesc($callback, $options = SORT_REGULAR)
         return $this->sortBy($callback, $options, true);
     }
 
+    /**
+     * Sort the collection keys.
+     *
+     * @param int $options
+     * @param bool $descending
+     * @return static
+     */
+    public function sortKeys($options = SORT_REGULAR, $descending = false)
+    {
+        $items = $this->items;
+
+        $descending ? krsort($items, $options) : ksort($items, $options);
+
+        return new static($items);
+    }
+
+    /**
+     * Sort the collection keys in descending order.
+     *
+     * @param int $options
+     * @return static
+     */
+    public function sortKeysDesc($options = SORT_REGULAR)
+    {
+        return $this->sortKeys($options, true);
+    }
+
     /**
      * Splice a portion of the underlying collection array.
      *

tests/Support/SupportCollectionTest.php

@@ -943,6 +943,20 @@ public function testSortByAlwaysReturnsAssoc()
         $this->assertEquals([1 => 'dayle', 0 => 'taylor'], $data->all());
     }
 
+    public function testSortKeys()
+    {
+        $data = new Collection(['b' => 'dayle', 'a' => 'taylor']);
+
+        $this->assertEquals(['a' => 'taylor', 'b' => 'dayle'], $data->sortKeys()->all());
+    }
+
+    public function testSortKeysDesc()
+    {
+        $data = new Collection(['a' => 'taylor', 'b' => 'dayle']);
+
+        $this->assertEquals(['b' => 'dayle', 'a' => 'taylor'], $data->sortKeys()->all());
+    }
+
     public function testReverse()
     {
         $data = new Collection(['zaeed', 'alan']);