get yesterday's date? / get weather the current site is http://... or https://...

[wpearsall]

OK first of all,

How can i get yesterday's date?

I mean in the format:

date("d m, Y"); 

(Simply:

$yesterday  = date("d") - 1;
$yesterday .= " ".date("m, Y"); 

doesn't cut it (like i thought it mite [dummy me ]) as d - 1 = 0 if its the first etc.. and the month etc :@

Next:

Is there a HTTP_SERVER_VARS[?] or getenv("?") call to get weather the current site is http:// or https:// ?

tnx

Oh also: mSQL (Microsoft SQL Server):

is there an equivilent to MySQL_Error() for it?

ta

[phpman]

1) $yesterday = strtotime("-1 day"), "\n";
$yesterday = " ".date("m, Y", $yesterday);

2) actually I just found out, by testing, that you can see if https is on by this $_SERVER['HTTPS'] will echo "on" or NULL if off. I am not sure if ftp is the same way.

3) msql_error