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***** Fun with Object Cloning ***** Cloned p3 and stored new Point in p4 Before modification: p3: X = 100; Y = 100; Name = Jane; ID = 133d66a7-0837-4bd7-95c6-b22ab0434509 p4: X = 100; Y = 100; Name = Jane; ID = 133d66a7-0837-4bd7-95c6-b22ab0434509 Changed p4.desc.petName and p4.X After modification: p3: X = 100; Y = 100; Name = My new Point; ID = 133d66a7-0837-4bd7-95c6-b22ab0434509 p4: X = 9; Y = 100; Name = My new Point; ID = 133d66a7-0837-4bd7-95c6-b22ab0434509

You could also override the variable by setting it in your settings.php file: $conf = array( 'session_inc' => './sites/all/modules/memcache/memcache-session.inc, ... );

To have your Clone() method make a complete deep copy of the internal reference types, you need to configure the object returned by MemberwiseClone() to account for the current point s name (the System.Guid type is in fact a structure, so the numerical data is indeed copied). Here is one possible implementation: // Now we need to adjust for the PointDescription member. public object Clone() { // First get a shallow copy. Point newPoint = (Point)this.MemberwiseClone(); // Then fill in the gaps. PointDescription currentDesc = new PointDescription(); currentDesc.PetName = this.desc.PetName; newPoint.desc = currentDesc; return newPoint; } If you rerun the application once again and view the output (see below), you see that the Point returned from Clone() does copy its internal reference type member variables (note the pet name is now unique for both p3 and p4). ***** Fun with Object Cloning ***** Cloned p3 and stored new Point in p4

Before modification: p3: X = 100; Y = 100; Name = Jane; ID = 51f64f25-4b0e-47ac-ba35-37d263496406 p4: X = 100; Y = 100; Name = Jane; ID = 0d3776b3-b159-490d-b022-7f3f60788e8a Changed p4.desc.petName and p4.X After modification: p3: X = 100; Y = 100; Name = Jane; ID = 51f64f25-4b0e-47ac-ba35-37d263496406 p4: X = 9; Y = 100; Name = My new Point; ID = 0d3776b3-b159-490d-b022-7f3f60788e8a

If the browser doesn t accept cookies, a session cannot be established because the PHP directive sessions_use_only_cookies has been set to 1 and the alternative (passing the PHPSESSID in the query string of the URL) has been disabled by setting sessions.use_trans_sid to 0. This is a best practice, as recommended by Zend (see http://php.net/session.configuration):

To summarize the cloning process, if you have a class or structure that contains nothing but value types, implement your Clone() method using MemberwiseClone(). However, if you have a custom type that maintains other reference types, you need to create a new object that takes into account each reference type member variable.

Building Comparable Objects (IComparable)

URL-based sessi on management has additional s ecurity risks c ompared t o co okiebased session management. Users m ay send a URL that contains an active session ID to their fri ends by e-mail or users may save a URL that contains a session ID t o their bookmarks and access your site with the same session ID always, for example.

The System.IComparable interface specifies a behavior that allows an object to be sorted based on some specified key. Here is the formal definition: // This interface allows an object to specify its // relationship between other like objects. public interface IComparable { int CompareTo(object o); }

Note The generic version of this interface (IComparable<T>) provides a more type-safe manner to handle comparisons between objects. You ll examine generics in 10.

Figure 31-27. The MouseStateGroup Using the Add State button, add three states to the MouseStateGroup, named MouseEnterStar, MouseExitStar and MouseDownStar (Figure 31-28).

When PHPSESSID appears in the query string of a site, it s typically a sign that the hosting provider has locked down PHP and doesn t allow the ini_set() function to set PHP directives at runtime. Alternatives are to move the settings into the .htaccess file (if the host is running PHP as an Apache module) or into a local php.ini file (if the host is running PHP as a CGI executable). To discourage session hijacking (where someone grabs a session ID out of an old cookie and attempts to reuse that session ID see http://en.wikipedia.org/wiki/Session_hijacking), the session ID is regenerated when a user logs in (see the user_login_finalize() function in modules/user/user.module). The session is also regenerated when a user changes his or her password.