How can I force users to access my page over HTTPS instead of HTTP?

The way I've done it before is basically like what you wrote, but doesn't have any hardcoded values:

if($_SERVER["HTTPS"] != "on")
{
    header("Location: https://" . $_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"]);
    exit();
}

You could do it with a directive and mod_rewrite on Apache:

<Location /buyCrap.php>
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
</Location>

You could make the Location smarter over time using regular expressions if you want.

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