function userLink($username, $userID) { $link = '' . $username . ''; return $link; } echo "Welcome " . userLink("JohnDoe", 1234) . " to our website!";In this example, the `userLink` function takes two arguments: `$username` and `$userID`. The function then creates a URL that includes the `$userID` parameter, which can be used to retrieve the user's profile information from the website's database. The function returns the HTML code for a link that displays the user's username and links to their profile page. The `userLink` function is not part of a standard PHP library or package, but rather is typically defined in a custom PHP script specific to a particular website or application.