daily-email: add 2023-04-16

src/content/daily-email/2023-04-16.md

@@ -0,0 +1,39 @@
+---
+title: >
+  Refactoring with readonly classes in PHP 8.2
+pubDate: 2023-04-16
+permalink: >
+  archive/2023/04/16/refactoring-with-readonly-classes-in-php-8-2
+tags:
+  - php
+---
+
+Marian Kostadinov ([stochnagara on Twitter](https://twitter.com/stochnagara)) replied to Friday's email about DTOs and value objects to tell me about `readonly` classes, which can be done in PHP 8.2.
+
+Looking at the previous class:
+
+```php
+class AccountDetails {
+
+  public function __construct(
+    public readonly string $accountNumber,
+    public readonly string $sortCode,
+  ) {}
+  
+}
+```
+
+Instead of setting each property as `readonly`, the whole class can instead be marked as `readonly`:
+
+```php
+readonly class AccountDetails {
+
+  public function __construct(
+    public string $accountNumber,
+    public string $sortCode,
+  ) {}
+  
+}
+```
+
+Thanks for the suggestion, Marian!