PHP Get Site URL Protocol – http vs https

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I’ve written a little function to establish the current site url protocol but I don’t have SSL and don’t know how to test if it works under https. Can you tell me if this is correct?

function siteURL()
{
    $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
    $domainName = $_SERVER['HTTP_HOST']."https://stackoverflow.com/";
    return $protocol.$domainName;
}
define( 'SITE_URL', siteURL() );

Is it necessary to do it like above or can I just do it like?:

function siteURL()
{
    $protocol="http://";
    $domainName = $_SERVER['HTTP_HOST']."https://stackoverflow.com/"
    return $protocol.$domainName;
}
define( 'SITE_URL', siteURL() );

Under SSL, doesn’t the server automatically convert the url to https even if the anchor tag url is using http? Is it necessary to check for the protocol?

Thank you!

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