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copied!<p>This seems possible by using a <a href="http://www.php.net/manual/en/language.oop5.overloading.php#language.oop5.overloading.members" rel="nofollow noreferrer">magic setter function</a> that you define in <code>foo</code>, but comes with a serious caveat. Magic getters and setters <em>fire only when you access an inaccessible property.</em> </p> <p>When operating inside a class, all properties, no matter whether declared private, public or protected, are usually accessible, so the magic getter and setter functions will not fire. There is only one exception: Properties that were declared <code>private</code> in an ancestor class. Those will be hidden (inaccessible) to descendant classes, and the magic functions will fire.</p> <p>This means that you will need to declare <code>bar</code> and <code>baz</code> in <code>foo</code>. It wouldn't work if you would declare them in <code>foobar</code>, because they would become accessible. </p> <p>With this in mind, the following will work as you want:</p> <pre><code>class foo { private $bar = false; private $baz = NULL; public function __set($name, $value) { if ($name == "bar") { if ($value == true) { if ($this->baz == null) throw new Exception(); } } } } class foobar extends foo { function test() { $this->bar = "TEST"; } } $foobar = new foobar(); $foobar->test(); // Will throw an exception </code></pre> <p>If you want to read <code>bar</code> and <code>baz</code> from within <code>foobar</code>, you will also need to define a magic getter function.</p>

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