mod rewrite / php question

I am using mod rewrite to force all SSL on all my pages.   My question is I have some php that I do not know the proper ways to handle the url now.  It works the way it is I just did not know if that is correct.

Do I leave this as http or do I change it to https

$logo_info = getimagesize("http://www.prizemagnet.com".$logo);

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This is the mod rewrite I am using to force the SSL.

RewriteEngine On
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://example.com/$1 [R=301,L]

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