define ()

[treeleaf20]

I have the following code:

$path = "/home/web/public_html/user/images/".$_SESSION['Userid']."";
echo $path;
define('SFU_REALPATH', '/home/web/public_html/user/images/$_SESSION[Userid]');

When I echo $path it shows up as:
/home/web/public_html/user/images/2

but when I do echo SFU_REALPATH it shows up as:
/home/web/public_html/user/images/$_SESSION[Userid]

Why doesn't it resolve in the define() but does outside of it?

Thanks for any advice on how to do this.

[crazychris]

\
path = "/home/web/public_html/user/images/".$_SESSION['Userid'].""; 
echo $path; 
define('SFU_REALPATH', "/home/web/public_html/user/images/".$_SESSION['Userid']);

[dalecosp]

Because single quotes indicate that a string is a literal string in most programming languages.