Q:

Is it okay to name a cookie starting with a number? 

I want to know if is it okay to name a cookie starting with a number.  Actually, I've tested the following code using Apache2.2.21, PHP 5.3.8 and Chrome 19.0.1084.46:
setcookie('1test', 'a value'); 
if (isset($_COOKIE['1test'])) echo $_COOKIE['1test'];

It works just fine under these conditions, but what I want to know: is there any spec or RFC that recommends not to do it? 

A:

I don't see anything in the specs that says you can't use a number as the first character in a cookie's name.