How do I delete a comma [,] from a sesseion?

[flit]

Hi there,

 

Can anyone help me delete a comma from a session

My session file looks like this

 

id|s:8:"1,2,3,";

 

I know how to delete a variable from a session [unset($_SESSION['2']);],

but I cannot delete the last comma from the session. I would like the session

file to look like this:

id|s:8:"1,2,3";  instead of  id|s:8:"1,2,3,";

 

[papaface]

$_SESSION['2'] = rtrim($_SESSION['2'],",");

[flit]

Thanks dude!