How do you check for more than 1 letter for a variable?

[Dylanblitz]

Originally Posted by Boofo

How do you check to make sure that a variable only allows 1 letter or number? Here is the variable I am using in the php file:

$vbulletin->GPC['letter']

I want to do a check to make sure only one letter or number is entered. Right now you can enter anything for it.

Untested but it should work

PHP Code:

if ((strlen($vbulletin->GPC['letter']) == 1) && preg_match('/^[a-zA-Z0-9]+$/', $vbulletin->GPC['letter']))
{
//good value processing
} else {
//error code here
} 


First part makes sure it's only 1 character long, second part makes sure it's only letters and numbers