Re-add syntax highlighting to daily emails and

...ATDC lessons

source/_daily_emails/2023-08-19.md

@@ -14,7 +14,7 @@ In PHP, this is done by throwing an Exception if a condition is met.
 
 For example:
 
-```php
+```language-php
 if (!is_array(false)) {
   throw new \Exception('Not an array');
 }
@@ -22,13 +22,13 @@ if (!is_array(false)) {
 
 There's also the `assert` construct which, since PHP 8.0, throws an Exception by default:
 
-```php
+```language-php
 assert(is_array(false));
 ```
 
 You can also use an assertion library, such as `webmozart/assert` or `beberlei/assert` which provide assertions and guard methods:
 
-```php
+```language-php
 use Webmozart\Assert\Assert;
 
 Assert::isArray(false);