Description:
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From manual page: http://www.php.net/function.session-name#Parameters
---

The session name references the session id in cookies and URLs. It should 
contain only alphanumeric characters; it should be short and descriptive (i.e. 
for users with enabled cookie warnings). If name is specified, the name of the 
current session is changed to its value.

The first sentence should be changed. It is confusing as it could mean the 
session id itself, it should be rephrased to:

The session name references the variable name used to store the session id in 
cookies and URLs; it should be short and descriptive (i.e. for users with 
enabled cookie warnings). If name is specified, the name of the current session 
is changed to its value.