How can PHP developers ensure that each database-fetched URL is displayed as a clickable link on a webpage?

To ensure that each database-fetched URL is displayed as a clickable link on a webpage, PHP developers can use the `echo` function along with the `<a>` HTML tag to output the URL as a clickable link. They can fetch the URL from the database, sanitize it to prevent any security risks, and then echo it within the `<a>` tag with the appropriate anchor text.

// Assuming $url contains the fetched URL from the database
$sanitized_url = filter_var($url, FILTER_SANITIZE_URL);
echo '<a href="' . $sanitized_url . '">' . $sanitized_url . '</a>';