How to write a link like <a href="#id"> which link to the same page in PHP?

In PHP, you can use the echo function to output an HTML <a> tag with a "#id" value for the href attribute, which will link to the same page. For example:

echo '<a href="#id">Link to same page</a>';

This will output an HTML link that, when clicked, will take the user to the same page with the element with the matching id of "#id"

<a href="#id">Link to same page</a>

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You can then use javascript to scroll the page to the id

<script>
    document.querySelector('a[href="#id"]').addEventListener('click', function(event) {
        event.preventDefault();
        document.getElementById('id').scrollIntoView({
            behavior: 'smooth'
        });
    });
</script>

This will scroll the page smoothly to the element with the matching id of "#id"