Add php 8 news

Author: rgomezcasas

php8-news/1-nullsafe_operator.php

@@ -0,0 +1,26 @@
+<?php
+declare(strict_types=1);
+
+final class Course {
+    public function categories(): ?array
+    {
+        return null;
+    }
+}
+
+$course = new Course();
+
+// Before
+$firstCategoryName = null;
+if (null !== $course) {
+    if (null !== $course->categories()) {
+        if (null !== $course->categories()->first()) {
+            $firstCategoryName = $course->categories()->first()->name();
+        }
+    }
+}
+
+// After
+$firstCategoryName = $course?->categories()?->first()?->name();
+
+var_dump($firstCategoryName);

php8-news/10-named_arguments.php

@@ -0,0 +1,26 @@
+<?php
+
+final class Course
+{
+    public function __construct(
+        private string $id,
+        private string $name,
+        private bool $isPublic
+    ) {
+    }
+}
+
+$course = new Course(
+    "14f5f65c-f6a9-4144-87ad-cf938945b203",
+    "Novedades PHP 8",
+    isPublic: false
+);
+
+$course2 = new Course(
+    name: "Novedades PHP 8",
+    id: "14f5f65c-f6a9-4144-87ad-cf938945b203",
+    isPublic: false
+);
+
+var_dump($course);
+var_dump($course2);

php8-news/2-static_return_type.php

@@ -0,0 +1,15 @@
+<?php
+
+abstract class Step {
+    public static function create(): static {
+        return new static();
+    }
+}
+
+final class VideoStep extends Step {
+}
+final class QuizStep extends Step {
+}
+
+var_dump(VideoStep::create());
+var_dump(QuizStep::create());

php8-news/3-class_object.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Codely\YouTube\PhpNews;
+
+final class Course {
+    public function categories(): ?array
+    {
+        return null;
+    }
+
+    public static function create(): self
+    {
+        return new self();
+    }
+}
+
+$course = new Course();
+
+var_dump(Course::class);
+var_dump($course::class);
+var_dump((new Course())::class);
+var_dump(Course::create()::class);

php8-news/4-union_types.php

@@ -0,0 +1,14 @@
+<?php
+
+final class User {
+    private float|int $age;
+
+    public function __construct(int|float $age)
+    {
+        $this->age = $age;
+    }
+
+}
+
+var_dump(new User(18));
+var_dump(new User(18.5));

php8-news/5-throw_expression.php

@@ -0,0 +1,14 @@
+<?php
+
+$user = null;
+
+
+// Before
+if (null !== $user) {
+    echo $user;
+} else {
+    throw new Exception();
+}
+
+// After
+echo $user ?? throw new Exception();

php8-news/6-empty_catch.php

@@ -0,0 +1,9 @@
+<?php
+
+$user = null;
+
+try {
+    echo $user ?? throw new Exception();
+} catch (Exception) {
+    echo "Some error just happened";
+}

php8-news/7-attributes.php

@@ -0,0 +1,25 @@
+<?php
+
+use Symfony\Component\Routing\Annotation\Route;
+
+// Before
+final class CoursePostController
+{
+    /**
+     * @Route("/courses", "create_course")
+     */
+    public function create(): Response
+    {
+        // Controller stuff
+    }
+}
+
+// After
+final class NewCoursePostController
+{
+    #[Route('/courses', 'create_course')]
+    public function create(): Response
+    {
+        // Controller stuff
+    }
+}

php8-news/7.1-attributes_examples/src/SomeController.php

@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+use Symfony\Component\Routing\Annotation\Route;
+
+class SomeController
+{
+    #[Route('/path', name: 'action')]
+    public function someAction()
+    {
+        // ...
+    }
+}

php8-news/7.1-attributes_examples/src/SomeService.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+use Symfony\Contracts\Service\Attribute\Required;
+
+class SomeService
+{
+    #[Required]
+    public Bar $bar;
+
+    #[Required]
+    public function setFoo(Foo $foo): void
+    {
+        // ...
+    }
+}