is_???? evaluating a variable

[asolell]

Hi folks,

I need the variable to arrive to the page as a number.
If it is Zero or anything else other than a number (string or null)
I need the page to stop.

How do I do that?
I tried to test just for the is_string(), but it didn't work.
What am I missing? And next,.. I'll need the code for null

I think I should use is_null().
either way, the simple test of the code here, only works with a Zero. If I enter AAA it doesn't work- it doesn't die.

if ( ( $Id == 0) || (is_string($Id)) )
{
die("Sorry Buddy you got to check the number again.");
exit;
}

Could you suggest of a solution?

Thanks,

-Alon
[e-mail]

[evo4ever]

change $id == 0

to

$id == ""

[asolell]

But that's the part of the code that does work!
the car_id needs to be an integer.
if someone enters "AAA", then I want it to fail also.
It doesn't fail.
It is as if the is_string() is NOT working.
Is it bad syntax?

-Alon.

[e-mail]

[diego25]

Have you tried outputting what $Id is?

Do you have register_globals on? If not, then you'd have to use $_GET['Id']

Diego

[asolell]

The Mystery has been resolved (at least I think I know why):

Upon entering the page I had the following check:

if(!isset($Id))
{
die("Need 'Id' parameter");
} else
{
$Id=addslashes($Id);
}

Later,.. I've added the check for the is_string etc...
As it turned out,... this line

$Id=addslashes($Id);

I believe was the source of all my trouble.
By adding the slashes, I've changed the value from whatever it was to a string like or someother type of variable.
Hence,. I was doing all sorts of actions AFTER the change and of course the outcome was unexpected.

This was a copied line segment from another file and since the Id is always numeric, I've simply removed the else statement and voilla,.. it works like a charm.
Thanks for your suggestions and help.
Thank you Diego, as I was working your suggestion I then noticed the very first input process of the variable. BTW, how I tell if register_global is on? will it show in info_php()?

-Alon.