scope of classes in PHP

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Hi
I'm developing an app to administer LDAP (phpLdapAdmin is too complex for the 
customer).
I have created an LDAP class, in a file class_ldap.php. It include methods for 
connecting to the server, binding a DN (effectively login), and adding posix 
groups.

I have an index.php with include_once 'class_ldap.php', which allows me to 
login using the HTTP authentication mechanism.

The connect method stores the resulting connection resource in a global 
variable (included in a config.php file).
When I then go to add the posix group (from add_group.php, that also includes 
class_ldap.php), I find that the global connection variable is not valid.

My question is, do I need to connect and authenticate with the LDAP server 
every time I want to perform an action, or is there a way to establish a 
connection for the user's session, that is cleared when the user logs out.

Many thanks,

Stuart.
-- 
---------------------------------------
Stuart Bailey BSc (hons) CEng CITP MBCS
         LinuSoft (Proprietor)
           Linux Specialist
            (01953) 601294
            (07778) 383739
       http://www.linusoft.co.uk
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