Update examples/01-blog with latest best practices (#856)

Author: spawnia

examples/01-blog/Blog/AppContext.php

@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 namespace GraphQL\Examples\Blog;
 
 use GraphQL\Examples\Blog\Data\User;
@@ -8,18 +11,10 @@
  */
 class AppContext
 {
-    /**
-     * @var string
-     */
-    public $rootUrl;
+    public string $rootUrl;
 
-    /**
-     * @var User
-     */
-    public $viewer;
+    public User $viewer;
 
-    /**
-     * @var \mixed
-     */
-    public $request;
+    /** @var array<string, mixed> */
+    public array $request;
 }

examples/01-blog/Blog/Data/Comment.php

@@ -1,23 +1,28 @@
 <?php
-namespace GraphQL\Examples\Blog\Data;
 
+declare(strict_types=1);
+
+namespace GraphQL\Examples\Blog\Data;
 
 use GraphQL\Utils\Utils;
 
 class Comment
 {
-    public $id;
+    public int $id;
 
-    public $authorId;
+    public int $authorId;
 
-    public $storyId;
+    public int $storyId;
 
-    public $parentId;
+    public ?int $parentId = null;
 
-    public $body;
+    public string $body;
 
-    public $isAnonymous;
+    public bool $isAnonymous = true;
 
+    /**
+     * @param array<string, mixed> $data
+     */
     public function __construct(array $data)
     {
         Utils::assign($this, $data);