you can use regluar expressions, or single character scanning via for loop,

if (ereg('[^a-z0-9]', $name)) print 'error!';

2)For loop
for ($i=0;$i<strlen($name)$;$i++)
if ($name[$i] == '@' || $name[$i]=='!' .. ....) print 'error!';

"Phantom" <[EMAIL PROTECTED]> wrote in message
> Anyone know a good PHP function or script to scan a string for Valid
> Characters to make sure something that is not allow is not included in a
> form?
> $Name = "#@@##@!#!@" would not be a valid alphabetical name, how do I
> scan for that in PHP?  Thanks.

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