How can articles be displayed with a "read more" option without reloading the page in PHP?

To display articles with a "read more" option without reloading the page in PHP, you can use AJAX to load the full article content dynamically when the user clicks on the "read more" link. This allows for a smoother user experience without having to reload the entire page.

```php
<!-- HTML code to display articles with "read more" option -->
<div class="article">
    <h2>Title</h2>
    <p class="excerpt">Short excerpt of the article</p>
    <a href="#" class="read-more">Read more</a>
    <div class="full-content" style="display: none;"></div>
</div>

<!-- jQuery code to handle AJAX request and display full article content -->
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
    $(document).ready(function() {
        $('.read-more').click(function(e) {
            e.preventDefault();
            var article = $(this).closest('.article');
            var fullContent = article.find('.full-content');

            if (fullContent.html() === '') {
                $.get('get_full_article.php', { id: article.data('id') }, function(data) {
                    fullContent.html(data);
                    fullContent.slideDown();
                });
            } else {
                fullContent.slideToggle();
            }
        });
    });
</script>
```

In the above code snippet, we have a basic HTML structure for displaying articles with a "read more" link. We then use jQuery to handle the click event on the "read more" link and make an AJAX request to fetch the full article content from the server. The full content is then displayed in a hidden div below the excerpt, which is toggled to show/hide when the user clicks on the "read more" link.