testing whether a variable is numerical

[Joan_Collins]

Hi,

I have a script that's collecting variables, and I have an associative array that's replacing those I've collected.

One variable will always be numerical, but it'll pop up in different places - I don't think the associative array will cover it.

What I want to do is replace the numerical value with a different variable (the script already knows what this will be). The numerical variable is always an article id. When the script encounters it, I want it to replace it with the article title (grabbed elsewhere in the script).

Can anybody tell me how to test as to whether a variable is numerical (only - if a number is within a variable, I'm not worried... I only want a true result if it's "only" numerical) in php?

Thanks!

[edwardsbc]

This should get you started:

http://www.php.net/manual/en/function.is-numeric.php

[Joan_Collins]

Thanks for the help! I had some trouble getting is_numeric to work (it seemed to always return false), but one of the functions lower down in the comments section was just what I was looking for.