Getting unix timestamp in milliseconds in PHP5 and Actionscript3

Question

In Actionscript, the Unix timestamp in milliseconds is obtainable like this:

public static function getTimeStamp():uint
        {
            var now:Date = new Date();
            return now.getTime();
        }

The doc clearly states the following:

getTime():Number Returns the number of milliseconds since midnight January 1, 1970, universal time, for a Date object.

When I trace it, it returns the following:

824655597

So, 824655597 / 1000 / 60 / 60 / 24 / 365 = 0.02 years. This is obviously not correct, as it should be around 39 years.

Question #1: What's wrong here?

Now, onto the PHP part: I'm trying to get the timestamp in milliseconds there as well. The microtime() function returns either a string (0.29207800 1246365903) or a float (1246365134.01), depending on the given argument. Because I thought timestamps were easy, I was going to do this myself. But now that I have tried and noticed this float, and combine that with my problems in Actionscript I really have no clue.

Question #2: how should I make it returns the amount of milliseconds in a Unix timestamp?

Timestamps should be so easy, I'm probably missing something.. sorry about that. Thanks in advance.

EDIT1: Answered the first question by myself. See below.
EDIT2: Answered second question by myself as well. See below. Can't accept answer within 48 hours.

Answer 1

I used unsigned integer as the return type of the function. This should be Number.

public static function getTimeStamp():Number
        {
            var now:Date = new Date();
            return now.getTime();
        }

Think I got the function for getting milliseconds in PHP5 now.

function msTimeStamp() {
    return round(microtime(1) * 1000);
}