Posted by C. (http://symcbean.blogspot.com/) on 01/10/08 10:44

On 10 Jan, 10:05, shror <shahi...@gmail.com> wrote:
> Hi every body,
>
> I have a really serious question which is what is the difference
> between $message & $$message, I know the uses of $message which is the
> assigning of a variables and for the forms POST & GET, but what is the
> uses of $$mesage
>

$message='hello';
$hello='world';

print "$message $$message"; // writes "hello world"

print "$$hello"; // will give a warning because $world is not defined

> also I have another Database question, Its a question I've been asked
> in an interview but am just a beginner in DataBase, the question was
> that:
> Company need to create a DB once and do no more edits in the future on
> the DB, the DB contains Category name, Sub-category, sub-sub-category
>
> so this means three level tree how to create a DB using this hierarchy
> and in the future if the sub-sub got another sub how could this be
> done without the need of a DB designer??
>

Its trivial, there's lots of answers - but its way OT. Try asking in a
DB forum.

C.

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