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    <p>From comment below question:</p> <blockquote> <p>because I would like to install call event handlers on classes, without the classes knowing about it, so I would know that the user is calling a method from a class before that method is actually called. </p> </blockquote> <p>Solution: use a Decorator.</p> <pre><code>class EventDecorator { protected $_instance; public function __construct($instance) { $this-&gt;_instance = $instance; } public function __get($prop) { printf('Getting %s in %s', $prop, get_class($this-&gt;_instance)); return $this-&gt;_instance-&gt;$prop; } public function __set($prop, $val) { printf('Setting %s with %s in %s', $prop, $val, get_class($this-&gt;_instance)); return $this-&gt;_instance-&gt;$prop = $val; } public function __call($method, $args) { printf('Calling %s with %s in %s', $method, var_export($args, TRUE), get_class($this-&gt;_instance)); return call_user_func_array(array($this-&gt;_instance, $method), $args); } } </code></pre> <p>Then you can wrap any class into it:</p> <pre><code>class Foo { public $prop; public function doSomething() {} } $foo = new EventDecorator(new Foo); $foo-&gt;prop = 'bar'; // Setting prop with bar in Foo $foo-&gt;prop; // Getting prop in Foo $foo-&gt;doSomething('something'); // Calling doSomething with array (0 =&gt; 'something',) in Foo </code></pre> <p>This can be fleshed out to provide pre and post hooks. You could also make the Decorator use the <a href="http://sourcemaking.com/design_patterns/observer" rel="nofollow noreferrer">Subject/Observer Pattern</a> and fire events to whatever other object registered to the decorator. The above approach is more maintainable and understandable than monkeypatching random methods with runkit.</p> <p>Additional notes:</p> <ul> <li>You might be interested in the <a href="http://components.symfony-project.org/event-dispatcher/" rel="nofollow noreferrer">Symfonys EventDispatcher component</a>. </li> <li>If you are after Aspect Oriented programming, read <a href="http://sebastian-bergmann.de/archives/573-Current-State-of-AOP-for-PHP.html" rel="nofollow noreferrer">http://sebastian-bergmann.de/archives/573-Current-State-of-AOP-for-PHP.html</a> - it's from 2006 but there is not much changed in that field since then. </li> <li>If you are after horizontal reuse, you will like <a href="http://wiki.php.net/rfc/traits" rel="nofollow noreferrer">PHP's Trait functionality</a> that is supposed to be in one of the next few versions.</li> </ul>
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    1. CODecorator....nice! Thanks for that example Gordon!
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