docs: improve News Tutorial code

user_guide_src/source/tutorial/news_section.rst

@@ -98,7 +98,7 @@ some additional tools to make working with data simpler. Add the
 following code to your model.
 
 .. literalinclude:: news_section/002.php
-    :lines: 11-18
+    :lines: 11-23
 
 With this code, you can perform two different queries. You can get all
 news records, or get a news item by its slug. You might have

user_guide_src/source/tutorial/news_section/002.php

@@ -8,6 +8,11 @@ class NewsModel extends Model
 {
     protected $table = 'news';
 
+    /**
+     * @param false|string $slug
+     *
+     * @return array|null
+     */
     public function getNews($slug = false)
     {
         if ($slug === false) {

user_guide_src/source/tutorial/news_section/003.php

@@ -10,10 +10,10 @@ public function index()
     {
         $model = model(NewsModel::class);
 
-        $data['news'] = $model->getNews();
+        $data['news_list'] = $model->getNews();
     }
 
-    public function show($slug = null)
+    public function show(?string $slug = null)
     {
         $model = model(NewsModel::class);
 

user_guide_src/source/tutorial/news_section/004.php

@@ -11,8 +11,8 @@ public function index()
         $model = model(NewsModel::class);
 
         $data = [
-            'news'  => $model->getNews(),
-            'title' => 'News archive',
+            'news_list' => $model->getNews(),
+            'title'     => 'News archive',
         ];
 
         return view('templates/header', $data)

user_guide_src/source/tutorial/news_section/005.php

@@ -1,8 +1,8 @@
 <h2><?= esc($title) ?></h2>
 
-<?php if (! empty($news) && is_array($news)): ?>
+<?php if ($news_list !== []): ?>
 
-    <?php foreach ($news as $news_item): ?>
+    <?php foreach ($news_list as $news_item): ?>
 
         <h3><?= esc($news_item['title']) ?></h3>
 

user_guide_src/source/tutorial/news_section/006.php

@@ -9,13 +9,13 @@ class News extends BaseController
 {
     // ...
 
-    public function show($slug = null)
+    public function show(?string $slug = null)
     {
         $model = model(NewsModel::class);
 
         $data['news'] = $model->getNews($slug);
 
-        if (empty($data['news'])) {
+        if ($data['news'] === null) {
             throw new PageNotFoundException('Cannot find the news item: ' . $slug);
         }
 

user_guide_src/source/tutorial/static_pages.rst

@@ -159,7 +159,7 @@ If the requested page doesn't exist, a "404 Page not found" error is shown.
 The first line in this method checks whether the page actually exists.
 PHP's native ``is_file()`` function is used to check whether the file
 is where it's expected to be. The ``PageNotFoundException`` is a CodeIgniter
-exception that causes the default error page to show.
+exception that causes the 404 Page Not Found error page to show.
 
 In the header template, the ``$title`` variable was used to customize the
 page title. The value of title is defined in this method, but instead of

user_guide_src/source/tutorial/static_pages/001.php

@@ -9,7 +9,7 @@ public function index()
         return view('welcome_message');
     }
 
-    public function view($page = 'home')
+    public function view(string $page = 'home')
     {
         // ...
     }

user_guide_src/source/tutorial/static_pages/002.php

@@ -8,7 +8,7 @@ class Pages extends BaseController
 {
     // ...
 
-    public function view($page = 'home')
+    public function view(string $page = 'home')
     {
         if (! is_file(APPPATH . 'Views/pages/' . $page . '.php')) {
             // Whoops, we don't have a page for that!