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copied!<p>I needed LSB this for the following scenario: </p> <ul> <li>Imagine you're building a "mail processor" daemon that downloads the message from an email server, classifies it, parses it, saves it, and then does something, depending on the type of the message. </li> <li>Class hierarchy: you have a base Message class, with children "BouncedMessage" and "AcceptedMessage".</li> <li>Each of the message types has its own way to persist itself on disk. For example, all messages of type BouncedMessage try to save itself as BouncedMessage-id.xml. AcceptedMessage, on the other hand, needs to save itself differently - as AcceptedMessage-timestamp.xml. The important thing here is that the logic for determining the filename pattern is different for different subclasses, but <strong>shared</strong> for all items within the subclass. That's why it makes sense for it to be in a static method.</li> <li>Base Message class has an abstract static method (yes, abstract <em>AND</em> static) "save". BouncedMessage implements this method with a concrete static method. Then, inside the class that actually retrieves the message, you can call "::save()"</li> </ul> <p>If you want to learn more about the subject:</p> <ul> <li><a href="http://www.qcodo.com/forums/topic.php/2356" rel="nofollow noreferrer">http://www.qcodo.com/forums/topic.php/2356</a></li> <li><a href="http://community.livejournal.com/php/585907.html" rel="nofollow noreferrer">http://community.livejournal.com/php/585907.html</a></li> <li><a href="http://bugs.php.net/bug.php?id=42681" rel="nofollow noreferrer">http://bugs.php.net/bug.php?id=42681</a></li> </ul>

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