Why is it important to include proper protocols like "http://" when specifying URLs in PHP to avoid relative link interpretation by browsers?

When specifying URLs in PHP, it is important to include proper protocols like "http://" to avoid relative link interpretation by browsers. If the protocol is not specified, browsers may interpret the URL as a relative link, leading to unexpected behavior or errors. By including the protocol in the URL, browsers will recognize it as an absolute link and navigate to the correct destination.

$url = 'http://www.example.com'; // Specify the URL with the proper protocol
echo '<a href="' . $url . '">Example Link</a>'; // Output the link with the specified URL