Fixed flatten() failed, bacause INF is float. (#1454)

* 强制int参数,默认INF并不会有用，且会报错

* Added test cases.

* Update CHANGELOG.md

Co-authored-by: Donjan <Donjan@cqbaobao.cn>
Co-authored-by: 李铭昕 <715557344@qq.com>

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Fixed
 
 - [#1449](https://github.com/hyperf/hyperf/pull/1449) Fixed memory overflow for high cardinality request path.
+- [#1454](https://github.com/hyperf/hyperf/pull/1454) Fixed `flatten()` failed, bacause `INF` is `float`.
 
 # v1.1.21 - 2020-03-19
 

src/database/src/Model/Collection.php

@@ -437,8 +437,9 @@ class Collection extends BaseCollection implements CompressInterface
 
     /**
      * Get a flattened array of the items in the collection.
+     * @param float|int $depth
      */
-    public function flatten(int $depth = INF): BaseCollection
+    public function flatten($depth = INF): BaseCollection
     {
         return $this->toBase()->flatten($depth);
     }

src/utils/src/Arr.php

@@ -170,7 +170,7 @@ class Arr
 
     /**
      * Flatten a multi-dimensional array into a single level.
-     * @param mixed $depth
+     * @param float|int $depth
      */
     public static function flatten(array $array, $depth = INF): array
     {

src/utils/src/Collection.php

@@ -557,8 +557,9 @@ class Collection implements ArrayAccess, Arrayable, Countable, IteratorAggregate
 
     /**
      * Get a flattened array of the items in the collection.
+     * @param float|int $depth
      */
-    public function flatten(int $depth = INF): self
+    public function flatten($depth = INF): self
     {
         return new static(Arr::flatten($this->items, $depth));
     }

src/utils/tests/CollectionTest.php

@@ -44,4 +44,18 @@ class CollectionTest extends TestCase
         $res = $col->random(1);
         $this->assertTrue($res instanceof Collection);
     }
+
+    public function testFlatten()
+    {
+        $collection = new Collection([
+            'item' => [
+                'name' => 'Hyperf',
+            ],
+            'it' => [
+                'id' => $uuid = uniqid(),
+            ],
+        ]);
+
+        $this->assertSame(['Hyperf', $uuid], $collection->flatten()->toArray());
+    }
 }