please explain the code

[VenusJ]

Hello,
Can someone please explain in plain english the following code? I don't quite understand why there is a dot after $calculategoodids and why [$i], and why sizeof not count...

        //caculating good_ids
        for ($i=0;$i<sizeof($HTTP_POST_VARS['good_ids']);$i++)
        {
            $calculate_good_ids.=$HTTP_POST_VARS['good_ids'][$i]."-";
        }

thank you

[stolzyboy]

the dot is just appending it to itself, just like:

$query = "select * from table where";
$query .= " field = whatever";
$query .= "and anotherfield = whatever";

etc....

and sizeof is just an alias of count (used in the same way)

and the [$i] is just so you can loop thru the array