Is it recommended to format links directly in HTML or use CSS classes for styling in PHP?

It is recommended to use CSS classes for styling links in PHP instead of formatting them directly in HTML. This separation of concerns allows for easier maintenance and updating of styles across the entire website. By using CSS classes, you can apply consistent styles to all links with the same class, making it more efficient and organized.

<a href="#" class="styled-link">Link Text</a>
```

CSS:
```css
.styled-link {
  color: blue;
  text-decoration: none;
}

.styled-link:hover {
  color: red;
}