Get the full URL / Website address in PHP Function

How to get complete URL / website address

PHP function :

function url()
{
    if (isset($_SERVER['HTTPS'])) {
        $protocol = ($_SERVER['HTTPS'] && $_SERVER['HTTPS'] != "off") ? "https" : "http";
    } else {
        $protocol = 'http';
    }
    return $protocol . "://" . $_SERVER['HTTP_HOST'];
}

$SiteUrl = url();

// Print the Url

echo $SiteUrl;
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