Posted by John Nichel on 04/29/05 19:14

Philip Hallstrom wrote:
>> what kind of a function can I use that will tell me whether a variable is
>> alphanumeric (that is has only characters A-Z or 1-9 )?
>
>
> http://us3.php.net/manual/en/function.ctype-alnum.php
>
> bool ctype_alnum ( string text )
>
> Checks if all of the characters in the provided string, text, are
> alphanumeric. In the standard C locale letters are just [A-Za-z] and the
> function is equivalent to preg_match('/^[a-z0-9]*$/i', $text).
>
> Returns TRUE if every character in text is either a letter or a digit,
> FALSE otherwise.
>
> ----
>
> Note that if you pass in an empty string you'll also get TRUE...

I always forget about the c_type functions. Good call.

--
John C. Nichel
ÜberGeek
KegWorks.com
716.856.9675
john@kegworks.com

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