oh my god. here is an example.
$userLevels = array(
1 => 'Member',
2 => 'Admin',
4 => 'Writer',
8 => 'Expert');
$cat = 15;
for ($mask=1; $mask <= 64; $mask *= 2) {
if ( $mask & $cat ) {
print "Yes $mask is in $cat\n<br>";
}
}
here i didn't have to 'or' the IDs but it works fine
and i didn't really understand how it works?
what does it mean "if 2 & 15, 2 can be found in
15"???!!! is that a miracle;)
thank you bob...
--- bob parker <[EMAIL PROTECTED]> wrote:
> On Sun, 22 Sep 2002 01:10, you wrote:
>
> 1. To do that you should 'or' the categories when
> the ID's are
> to be in more than one category, not add them
> eg $category = $cat1 | $cat2;
>
> 2. To extract the categories within a compounded
> category
> use the 'and' operator '&'
>
> eg
>
> for ($mask=1; $mask <= 64; /*or whatever*/ $mask *=
> 2; ) {
> if ( $mask & $category ) {
> print "Yes $mask is in $category\n";
> }
> }
original---
> > consider there are categories and these have IDs
> like
> > below:
> > 1, 2, 4, 8, 16, 32, 64...
> >
> > if some data belongs to more than 1 category for
> > exemple 4 and 32, its category ID will be 36, the
> sum
> > of cat. IDs.
> > i guess this is used widely in programming. so,
> how
> > can i resolve the original IDs. i mean what kind
> of
> > script can tell me what+what1+what2...whatN = 79?
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