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<?php
// Include the Observable and Observer base classes
require_once('Observer/Observable.php');
require_once('Observer/Observer.php');
class Article extends Observable {
// To publish an article
function publish() {
echo ( 'Publishing article.<br />' );
// Perform query here that updates the database
$this->notifyObservers('published');
}
// To delete an article
function delete() {
echo ( 'Deleting article.<br />' );
// Perform query here that deletes an article
$this->notifyObservers('deleted');
}
}
class Cache extends Observer {
function update(& $source, $arg) {
switch ( $arg ) {
case 'published':
case 'deleted':
echo ( 'Refreshing cache<br />' );
break;
}
}
}
class Subscribers extends Observer {
function update(& $source, $arg) {
switch ( $arg ) {
case 'published':
echo ( 'Notifying subscribers by email<br />' );
break;
}
}
}
class RSSFeed extends Observer {
function update(& $source, $arg) {
switch ( $arg ) {
case 'published':
case 'deleted':
echo ( 'Updating the RSS Feed<br />' );
break;
}
}
}
// Create the observers
$cache = & new Cache();
$subscribers = & new Subscribers();
$rssfeed = & new RSSFeed();
// Create the observable
$article=& new Article();
// Add the observers to the observable
$article->addObserver($cache);
$article->addObserver($subscribers);
$article->addObserver($rssfeed);
if ( isset ( $_POST['publish'] ) ) {
$article->publish();
} else if ( isset ( $_POST['delete'] ) ) {
$article->delete();
} else {
?>
<form action="<?php echo ( $_SERVER['PHP_SELF'] ); ?>" method="post">
<textarea cols="50" rows="5">
This is a sample article
</textarea><br />
<input type="submit" name="publish" value="Publish Article"><br />
<input type="submit" name="delete" value="Delete Article"><br />
</form>
<?php
}
?>
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