Re-add syntax highlighting to daily emails and

...ATDC lessons

source/_pages/atdc/7.md

@@ -20,7 +20,7 @@ First, let's ensure that only published nodes are returned and displayed on the
 
 We can do this easily with a functional test, so add a new test method to `BlogPostTest`:
 
-```php
+```language-php
 public function testOnlyPublishedNodesAreShown(): void {
   PostBuilder::create()
     ->setTitle('Post one')
@@ -54,7 +54,7 @@ In this test, we want to create some published and unpublished posts and assert
 
 To fix the error, add this function so it exists:
 
-```php
+```language-php
 public function isPublished(): self {
   return $this;
 }
@@ -70,7 +70,7 @@ When using `PostBuilder` in the previous lesson, we were always providing a crea
 
 Update the `getPost()` method to only set the created time if the `created` property has a value.
 
-```php
+```language-php
 public function getPost(): NodeInterface {
   $post = Node::create([
     'title' => $this->title,
@@ -93,7 +93,7 @@ Now, we can see a similar error to the one before for `isNotPublished()`.
 
 Again, create the simplest version of the method so the test can progress:
 
-```php
+```language-php
 public function isNotPublished(): self {
   return $this;
 }
@@ -112,13 +112,13 @@ Within `PostBuilder`, we need to use the `isPublished` and `isNotPublished` meth
 
 First, add an `isPublished` property to the class and set it to be `TRUE` by default:
 
-```php
+```language-php
 private bool $isPublished = TRUE;
 ```
 
 Next, update the `isPublished()` and `isNotPublished()` methods to set the value appropriately:
 
-```php
+```language-php
 public function isNotPublished(): self {
   $this->isPublished = FALSE;
 
@@ -136,7 +136,7 @@ Even though `isPublished` is already true by default, doing this makes it explic
 
 Finally, within `getPost()`, update the code that creates the node to set the `status` property accordingly.
 
-```php
+```language-php
 $post = Node::create([
   'status' => $this->isPublished,
   'title' => $this->title,
@@ -152,7 +152,7 @@ We also need to update the `PostNodeRepository` as that is responsible for loadi
 
 Currently, all we're doing is this:
 
-```php
+```language-php
 $nodes = $nodeStorage->loadMultiple();
 ```
 
@@ -160,7 +160,7 @@ This will load all nodes, regardless of their type or status.
 
 To fix this, change this to use `loadByProperties()` instead:
 
-```php
+```language-php
 $nodes = $nodeStorage->loadByProperties();
 ```
 
@@ -170,7 +170,7 @@ Note: you can also use `->getQuery()` if you prefer and write the query yourself
 
 For this case, let's add a property for `status` and its value to be `TRUE`:
 
-```php
+```language-php
 $nodes = $nodeStorage->loadByProperties([
   'status' => TRUE,
 ]);
@@ -184,7 +184,7 @@ The other issue is all published nodes are returned, even if they aren't posts.
 
 Before adding this to `PostNodeRepository`, create a new failing test for it:
 
-```php
+```language-php
 public function testOnlyPostNodesAreShown(): void {
   PostBuilder::create()->setTitle('Post one')->getPost();
   PostBuilder::create()->setTitle('Post two')->getPost();
@@ -213,7 +213,7 @@ If you run the test, it should fail as expected:
 
 Now we have a failing test, let's add the extra condition to `PostNodeRepository`:
 
-```php
+```language-php
 $nodes = $nodeStorage->loadByProperties([
   'status' => TRUE,
   'type' => 'post',